Problems on reinstalling Oracle 10g

I had some problems on my previous Oracle XE installation, so I decided to remove it. After reinstalling it on Windows XP, nothing worked anymore. When I try to Go To Database Home Page, it doesnt load. Even the Run SQL Command Line doesnt start anymore.
All Oracle services are running on my computer (OracleMTSRecoveryService, OracleServiceXE and OracleXEClrAgent), except OracleJobSchedulerXE and OracleXETNSListener because I tried to start them but it didnt work.
I reinstalled Oracle XE several times without any success.
Please help me, I dont know what to do.

this might help marco, Solution: install on winxp open db homepage problem "server cannot be found
i just posted the solution before reading your thread.

Similar Messages

Problems to initiate oracle 10g express edition

Good afternoon I am speaking of Brazil with a text translator.
But I have installed Hundreds and I am trying to install oracle 10g express edition release 2.
I am with a problem in the Oracle 10g Express Edition in the installation part when I vo to initiate the service, it does not initiate.
And when I give I command /etc/init.d/oracle-xe status appears the following message: Your default context is user_u: system_r: unconfined_t. Of it you want you choose different one? [n]
I do not know more what to make to decide this.
I thank the attention.
Gabriel.
Message was edited by:
user523701

Oracle XE has it's own forum - to register and discuss XE problems with XE experts use URL http://www.oracle.com/technology/xe/registration
Once you have registered, you sign in to the forums and the link to the XE forum is there. But you do have to sign in as the user who registered XE.
You will also need to provide a few more pieces of information:
1) actual distro and version of Linux
2) userid used to install XE (should be root)
3) userid used to run "/etc/init.d/oracle-xe start" (should be root)

Netweaver 2004s installation problem on Windows: Oracle 10G

Hi Friends,
I would like to install Netweaver 2004S(with usage types AS ABAP, AS JAVA, BI, BI JAVA, EP & DI) on a server which has Windows 2003 server OS running on it.
The server has 6GB RAM and has 5GB of free space on C: and a free sapce of 60GB on H: & 50GB on I: respectively.The database that is to be used is Oracle 10g.
Do I need to install first SAP solution manger 4.0 on this or Can i proceed with Netweaver 2004 S installation???
I am installing a central system.
First I tried installing SAP solution manger 4.0 on this system and it went successfully. Now when i am installing Netweaver 2004s on the same machine, during installation I am asked whether to "install a MCOD or create a new database for this installation".
I chose Install MCOD and proceeded further with Installation. But my installation is taking a lot of time while executing the service :"Creating database schema". The message which i get on status bar is " Removing schema user SAPSR3" and the status remains the same.
Have any of you faced this problem ? Please let me know how you have proceeded further.
Before starting the installation one of the prerequisites " SWAP SPACE VALUES" for installation was not satisfied by my system and even then i proceeded with the installation.
Is it because of this SWAP space problem , my intsallation is strcuk?? or what could be the reason fo this?
Thanks
Diwakar

Hello Diwakar,
If you are just installing NW2004s then it is not mandatory to install Solution manager.
To increase the swap space --
Right click my on computer ->Select Properties -> Click Advanced Tab ->Click Settings (performance) -> Select Advanced Tab -> In virtual memory -> Change
you canIncrease swap space/page file here.
Do not install the system as MCOD, make the seperate database.
Do revert for further doubt.
Best Regards,
Sachin.

Can't uninstall or reinstall oracle 10g express edition in w/server 2003

Hi,
I need help from all of you, i already install oracle 10g express edition in
windows server 2003 in D drive. but i can't remove because the oracle not in
the add remove program so i download the windows install clean up to remove
but after remove it still in the all program i still can start and stop the
database but can't go to the database home page.The error message (the install
cannot proceed as service OracleServiceXE is present on the system. Remove the
service , reboot the systemand retry the installation) can any one guide me to use
command prompt to remove.
My email address [email protected]
Thanks

Hi,
Perform the following steps, this will solve your problem and can go with new installation. :-)
(Only perform the steps 7.2 section and here is the link : http://download.oracle.com/docs/cd/B25329_01/doc/install.102/b25143/toc.htm#BABDJDCD
Manually Removing Oracle Database XE
If the deinstallation is interrupted, follow these steps to manually remove Oracle Database XE from your computer:
Step 1: Stop the Oracle Database XE Services
Step 2: Remove the Oracle Database XE Registry Editor Settings
Step 3: Update the System Variable Path
Step 4: Remove Oracle Database XE from the Start Menu and Desktop
Step 5: Remove the Oracle Database XE Directories
Step 6: Install and Run the Windows Installer CleanUp Utility
7.2.1 Step 1: Stop the Oracle Database XE Services
Follow these steps:
1. Open the Windows Services utility: From the Start menu, select All Programs, then Administrative Tools, and then Services.
2. If any of the following Oracle services exist and have the status Started, then select each of the services, and click Stop:
OracleXE
OracleXETNSListener
OracleJobSchedulerXE
OracleXEClrAgent
OracleMTSRecoveryService
3.
Exit Services.
See also the Microsoft online help for more information on stopping services.
7.2.2 Step 2: Remove the Oracle Database XE Registry Editor Settings
Follow these steps:
1.
Log on to Windows with Windows administrative privileges.
2.
Ensure that you followed the instructions under "Step 1: Stop the Oracle Database XE Services" to stop the Oracle Database XE services.
3.
Start the Registry Editor at a command prompt:
SYSTEM_DRIVE:\> regedit
4.
Go to HKEY_CLASSES_ROOT.
5.
Delete the following keys:
NEED TO CONFIRM THE XE-SPECIFIC ONES.
6.
Go to HKEY_CURRENT_USER\Software.
7.
Under Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu\Programs, delete the Oracle Database 10g Express Edition key.
8.
Go to HKEY_LOCAL_MACHINE\SOFTWARE and search for the ORACLE group key.
9.
Expand the ORACLE group key and then delete the KEY_XE and OracleMTSRecoveryService keys.
10.
Go to HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBCINST.INI.
11.
Expand the ODBCINST.INI key and remove the Oracle in XE key.
12.
Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services.
13.
Delete the following keys:
OracleServiceXE
OracleXEClrAgent
OracleXETNSListener
14.
Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\Application.
15.
Delete the Oracle.xe key.
16.
Exit the Registry Editor.
17.
Restart your computer.
Thanks,
Rams...
Edited by: user10888288 on May 3, 2010 5:58 AM

Problem with installing Oracle 10g on Suse Linux

Hi everybody!
I downloaded Oracle 10g Express from this url:
http://www.oracle.com/technology/software/products/database/xe/htdocs/102xelinsoft.html
it is free version for developers.
I copied it into computer where was installed Suse Linux Enterprise Edition.
But when I run it shows this kind of error:
error: rpmReadSignature failed: region failed: BAD, tag 15872 type 2047 offset 20480 count 4096
error: oracle-xe-univ-10.2.0.1-1.i386.rpm cannot be installed
It was downloaded without any problem. But checksum is different from that shown on website. I think this is the problem.
What is the problem? Does anybody know answer?
Regards,
Seti's fiction

Yes, you appear to have a bad copy.
I have not had a problem when the check sum matched. Therefore I encourage you to download again.

PROBLEM IN INSTALLING ORACLE 10G ON WINDOWS 2003 SERVER(WIN2K3)

Hi to all,
I have successfully removed Oracle 9i from win2k3.Am unable to install oracle 10g on the same system.............. problem : Universal installer window stucks at 14%, no error......no resource utilization by installer(as viewed from task manager).
Please help i ve read the oracle installation documentation as well............

Ok gotcha !!!!!!!!!!!!! its a CRC error given by java
dats y it stucked :(
am hereby uploading the error:
java.util.zip.ZipException: invalid entry CRC (expected 0xc9e96252 but got 0x5651c9f5)
     at java.util.zip.ZipInputStream.readEnd(Unknown Source)
     at java.util.zip.ZipInputStream.read(Unknown Source)
     at java.io.FilterInputStream.read(Unknown Source)
     at oracle.sysman.oii.oiix.OiixFileOps.copyStream(OiixFileOps.java:1421)
     at oracle.sysman.oii.oiij.OiijFastJarExtracter.copyFileFromJar(OiijFastJarExtracter.java:258)
     at oracle.sysman.oii.oiij.OiijFastJarExtracter.copyJarContents(OiijFastJarExtracter.java:194)
     at oracle.sysman.oii.oiij.OiijFastJarExtracter.extract(OiijFastJarExtracter.java:143)
     at oracle.sysman.oii.oiij.OiijJarExtractQueue$OiijJarExtractWorker.run(OiijJarExtractQueue.java:341)
CAN SOMEONE SUGGEST ME WHAT TO DO NOW ???????????plz reply
ANKUR SHARMA

Problem on Installing Oracle 10g on Windows XP Professional

I'm getting the following error while I install Oracle 10g R1, on Windows XP Professional.
The Path enviroment variable is bigger than 1023 characters. This value cannont be set.
Has anyone seen this error before?

Hi,
you have two option to start your oracle service. your problem is your oracle serivce is not start.
for that you can start manully....
like
on command prompt.
cmd>net start oracleservice<sid>
or
you can set automatic for oracle service.
go services window. start >>>> run >>>> services.msc <<<enter>>>
check and select oracle services and right click and set automatic..
every time your system is reboot then oracle service is automatically is start.
regards
Taj

Finding problem in uninstalling Oracle 10g

Hi Everyone,
I installed Oracle 10g Server Database successfully on Windows Vista in my lapy. now i was tryin to uninstall it , i deleted all the keys containing oracle fro mthe registry as well i have deleted the folder ORACLE from the C drive , but still i am getting this error whil e trying to install it again
Checking for Oracle Home incompatibilities.....
Check complete. The overall result of this check is: Failed <<<<
Problem: Oracle Database 10g Release 2 can only be installed in a new Oracle Home
Recommendation: Choose a new Oracle Home for installing this product.
=======================================================================
Please suggest what step should i take next in order to get it back in my pc.
Thanks
Neha

user13101839 wrote:
Hi Everyone,
I installed Oracle 10g Server Database successfully on Windows Vista in my lapy. now i was tryin to uninstall it , i deleted all the keys containing oracle fro mthe registry as well i have deleted the folder ORACLE from the C drive , but still i am getting this error whil e trying to install it again
Checking for Oracle Home incompatibilities.....
Check complete. The overall result of this check is: Failed <<<<
Problem: Oracle Database 10g Release 2 can only be installed in a new Oracle Home
Recommendation: Choose a new Oracle Home for installing this product.
=======================================================================
Please suggest what step should i take next in order to get it back in my pc.
Thanks
NehaHi Neha and welcome to the forum!
What about environment variables? Have you deleted them also?

Problem to install oracle 10g on linux

Hi,
I want to install Oracle 10g on Linux
(I have Linux X76CLLCFAUU 2.6.18-194.17.1.el5 #1 SMP Mon Sep 20 07:12:06 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux)
, when i run ./runInstaller, i have the following error , do you known what is the problem :
DÃ©marrage d'Oracle Universal Installer...
VÃ©rification des exigences du programme d'installation...
VÃ©rification de la version du systÃ¨me d'exploitation : il doit s'agir deredhat-3, SuSE-9, redhat-4, UnitedLinux-1.0, asianux-1 or asianux-2
Echec <<<<
Fermeture d'Oracle Universal Installer ; le journal de cette session figure Ã l'emplacement /tmp/OraInstall2010-11-17_05-03-15PM/installActions2010-11-17_05-03-15PM.log

Hello,
VÃ©rification de la version du systÃ¨me d'exploitation : il doit s'agir deredhat-3, SuSE-9, redhat-4, UnitedLinux-1.0, asianux-1 or asianux-2
Echec <<<<So, when the Installer checked the OS Release, it didn't find the correct one.
The message said that you should have one of this OS:
Redhat-3, SuSE-9, Redhat-4, UnitedLinux-1.0, asianux-1 or asianux-2As previously posted, you should check from the Installation Guide that you have the right OS requirements before running the Installer.
Hope this help.
Best regards,
Jean-Valentin

Problem in connecting Oracle 10g with MII 12.1

Hi All,
I am trying to establish a connection between oracle 10g and MII 12.1, the following are the parameters which i gave for establishing connection
JDBC Driver : oracle.jdbc.driver.OracleDriver
Server URL : jdbc:oracle:thin:@essdev03:1521:ID1.
when I checked the status it is in error.
Following is the log corresponding to the error.
Unable to get a connection from the pool
[EXCEPTION]
java.sql.SQLException: ORA-00923: FROM keyword not found where expected
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:745)
at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:210)
at oracle.jdbc.driver.T4CStatement.executeForDescribe(T4CStatement.java:804)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1049)
at oracle.jdbc.driver.T4CStatement.executeMaybeDescribe(T4CStatement.java:845)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1154)
at oracle.jdbc.driver.OracleStatement.executeInternal(OracleStatement.java:1726)
at oracle.jdbc.driver.OracleStatement.execute(OracleStatement.java:1696)
at com.sap.xmii.Illuminator.tools.database.ConnectionPool.validateConnection(ConnectionPool.java:386)
at com.sap.xmii.Illuminator.tools.database.ConnectionPool.createConnectionObject(ConnectionPool.java:331)
at com.sap.xmii.Illuminator.tools.database.ConnectionPool.getConnectionObject(ConnectionPool.java:188)
at com.sap.xmii.Illuminator.tools.database.ConnectionHolder.getConnection(ConnectionHolder.java:89)
at com.sap.xmii.Illuminator.server.ConnectorStatus.<init>(ConnectorStatus.java:41)
at com.sap.xmii.Illuminator.connectors.IDBC.IDBC.getStatus(IDBC.java:50)
at JEE_jsp_Admin_ServerStatus_602051351_1258760302000_1260447354104._jspService(JEE_jsp_Admin_ServerStatus_602051351_1258760302000_1260447354104.java:236)
at com.sap.engine.services.servlets_jsp.lib.jspruntime.JspBase.service(JspBase.java:102)
at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:140)
at com.sap.engine.services.servlets_jsp.server.servlet.JSPServlet.service(JSPServlet.java:436)
at com.sap.engine.services.servlets_jsp.server.servlet.JSPServlet.service(JSPServlet.java:146)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at com.sap.engine.services.servlets_jsp.server.runtime.FilterChainImpl.runServlet(FilterChainImpl.java:162)
at com.sap.engine.services.servlets_jsp.server.runtime.FilterChainImpl.doFilter(FilterChainImpl.java:81)
at com.sap.xmii.system.SecurityFilter.doFilter(SecurityFilter.java:96)
at com.sap.engine.services.servlets_jsp.server.runtime.FilterChainImpl.doFilter(FilterChainImpl.java:73)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:461)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:298)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:396)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:385)
at com.sap.engine.services.servlets_jsp.filters.DSRWebContainerFilter.process(DSRWebContainerFilter.java:48)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)
at com.sap.engine.services.servlets_jsp.filters.ServletSelector.process(ServletSelector.java:76)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)
at com.sap.engine.services.servlets_jsp.filters.ApplicationSelector.process(ApplicationSelector.java:243)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)
at com.sap.engine.services.httpserver.filters.WebContainerInvoker.process(WebContainerInvoker.java:78)
at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)
at com.sap.engine.services.httpserver.filters.ResponseLogWriter.process(ResponseLogWriter.java:60)
at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)
at com.sap.engine.services.httpserver.filters.DefineHostFilter.process(DefineHostFilter.java:27)
at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)
at com.sap.engine.services.httpserver.filters.MonitoringFilter.process(MonitoringFilter.java:29)
at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)
at com.sap.engine.services.httpserver.filters.MemoryStatisticFilter.process(MemoryStatisticFilter.java:43)
at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)
at com.sap.engine.services.httpserver.filters.DSRHttpFilter.process(DSRHttpFilter.java:42)
at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78)
at com.sap.engine.services.httpserver.server.Processor.chainedRequest(Processor.java:428)
at com.sap.engine.services.httpserver.server.Processor$FCAProcessorThread.process(Processor.java:247)
at com.sap.engine.services.httpserver.server.rcm.RequestProcessorThread.run(RequestProcessorThread.java:45)
at com.sap.engine.core.thread.execution.Executable.run(Executable.java:115)
at com.sap.engine.core.thread.execution.Executable.run(Executable.java:96)
at com.sap.engine.core.thread.execution.CentralExecutor$SingleThread.run(CentralExecutor.java:314)
Can anyone help me in resolving this problem,
Thanks in advance.
Regards,
Shyam
Edited by: shyam sunder palanisamy on Dec 16, 2009 8:22 PM

Hi All,
The soultion of this is,
When we are establishing a connection with the Oracle database we need to take care of 4 things,
1. JDBC driver
2. Server URL
3. User name and password
4. Validation Query,
In my case the validation query was specific to SQL that is select getdate(). its should be replaced with select sysdate from dual.
than the above error il not happen.
Regards,
Shyam

Display Problem while installing Oracle 10g on RHEL 5

All,
I'm in the process of installing Oracle 10g R2 on RHEL4, when i'm trying to issue ./runInstaller i'm getting the below error.
I could get the xclock on the host, even then i'm getting below display error, could any one please help me to resolve this ?
e@dhcppc6 database]$ ./runInstaller
Starting Oracle Universal Installer...
Checking installer requirements...
Checking operating system version: must be redhat-3, SuSE-9, redhat-4, UnitedLinux-1.0, asianux-1 or asianux-2
Passed
All installer requirements met.
Preparing to launch Oracle Universal Installer from /tmp/OraInstall2009-11-18_02-21-10PM. Please wait ...[oracle@dhcppc6 database]$ Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified
Exception in thread "main" java.lang.InternalError: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.
at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
at sun.awt.X11GraphicsEnvironment.<clinit>(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(Unknown Source)
at java.awt.Window.init(Unknown Source)
at java.awt.Window.<init>(Unknown Source)
at java.awt.Frame.<init>(Unknown Source)
at oracle.ewt.popup.PopupFrame.<init>(Unknown Source)
at oracle.ewt.lwAWT.BufferedFrame.<init>(Unknown Source)
at oracle.sysman.oio.oioc.OiocOneClickInstaller.<init>(OiocOneClickInstaller.java:378)
at oracle.sysman.oio.oioc.OiocOneClickInstaller.main(OiocOneClickInstaller.java:2091)
[oracle@dhcppc6 database]$

export DISPLAY=<hostname>:0
Are you running from the same terminal or connecting remotely?
If connecting remotely, you need a Xserver running on the client machine.

Can't uninstall or reinstall oracle 10g express edition in windows server 2

Hi,
I need help from all of you, i already install oracle 10g express edition in windows server 2003 in D drive. but i can't remove because the oracle not in the add remove program so i download the windows install clean up to remove
but after remove it still in the all program i still can start and stop the database but can't go to the database home page. can any one guide me to use command prompt to remove.
Thanks

Hi,
I need help from all of you, i already install oracle 10g express edition in windows server 2003 in D drive. but i can't remove because the oracle not in the add remove program so i download the windows install clean up to remove
but after remove it still in the all program i still can start and stop the database but can't go to the database home page. can any one guide me to use command prompt to remove.
Thanks

Problem when installing oracle 10g on RHEL-4

greetings,
i have been trying to install oracle 10g on my linux machine for the past 10 days, everytimje i do all the steps and change the kernel parameters but when i start the runinstaller file. i get the folloeing error.
I don't know what this error is or why is it happening
you can find a snapshot of the error on the following link
http://www.4shared.com/dir/4180305/6152dc22/Oracle_errors.html
also another error is arising when i log in to the linux box with the user oracle... i have been having these errors for the past 10 days and i reached to the point where my knowledge won't help me more than ur experiences.
a snapshot of this error also is available in the above link

While I understand a picture is worth a thousand words, I backed off from the site as soon as it started providing active ads and spy-ware-like indications. If you want help (from me at least) please describe the symptoms.
You could also use the following sites to help with the install:
http://www.puschitz.com and http://ivan.kartik.sk

Please help me, a problem when install oracle 10g on the solaris 10

currently, I am installing the oracle 10g on the solaris 10, I am using DHCP and
my computer has no hostname, the following is copied from the 10g document,
When you run Oracle Universal Installer, an error may occur if name resolution is not set up. To avoid this error, before you begin installation, you must ensure that host names are resolved only through the /etc/hosts file.
To ensure that host names are resolved only through the /etc/hosts file:
1.
Verify that the /etc/hosts file is used for name resolution. You can do this by checking the hosts file entry in the nsswitch.conf file as follows:
# cat /etc/nsswitch.conf | grep hosts
The output of this command should contain an entry for files.
2.
Verify that the host name has been set by using the hostname command as follows:
# hostname
The output of this command should be similar to the following:
myhost.mycomputer.com
currently, when I use hostname command, it is unknown, what should I do to add
my hostname? thanks

Since this is related to Solaris, you will most likely get a better/faster response on a Sun Solaris forum rather than here.
Srini

Reinstalling Oracle 10g

Incidently, I had forgotten my oracle userid & password for my oracle. I had installed on to my laptop for my personal learning purpose. I uninstalled it and now when I planned on to reinstall oracle again, the install engine is crashing and I am not able to install. Any ideas what would solve this?
I had uninstalled oracle using the inbuild oracle universal installer itself. Now the same universal installer is not working after the uninstall. I had installed the default enterprise version. I had both Oracle database 10.2.0.2 and oracle developer suite 10.2.0.1 installed. both are uninstalled and I am not able to install either of them. Any help will be appreciated. Thank You.

You are Welcome
>Clean all environments variables related to ORACLE in your system
Double Click on System in the control panel
Select the Environment tab
Delete the ORACLE_HOME variable
Delete ORACLE_SID variable
Clean up the PATH variable (Remove all the paths that point to the ORACLE loadpoint)
2>Clean all entries related to ORACLE from the registry.
After uninstalling the application, leftover entries need to be manually deleted from the registry
Execute regedit and clean up the registry from all Oracle leftover keys. The best way to delete those values is by deleting the whole parent key:
Click Start
Click Run
Type "regedit" in the text box and hit Enter
In the Registry Editor window double click HKEY_LOCAL_MACHINE -> SOFTWARE and :
clean up the registry from all Oracle leftover keys
Then go to HKEY_LOCAL_MACHINE -> SYSTEM -> CurrentControlSet -> Service :
clean up the registry from all Oracle services leftover keys
Regards

Problems on reinstalling Oracle 10g

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