ORA-12560 HELP!

Question

Hello,
I found my step-son playing around with keys on my laptop and later on in the day, as usual, opened SQL developer and SQL plus to practice what I am learning on CBT nuggets tutorial for fundamentals exam. All of a sudden when i type in Username (hr) and Password i get ORA-12560: TNS:protocol adapter error .
I am currently using Oracle 11g Express edition and when i try running the shortcut 'Get started with Oracle Database 11g Express Edition' it opens a browser window and say Could not connect to 127.0.0.1:8080
After searching on the Oracle forums and other websites, i still cannot find a solution. I was wondering if maybe my step son accidentally blocked something to do with Oracle 11g when prompted by my anti-virus (Kaspersky) but as I was not there I do not know exactly what he did.
SQL developer gives me the follow error "Listener refused the connection with the following error: ORA-12505, TNS: Listener does not currently know of SID (shows Document icon) given in connect descriptor"
Upon running lsnrctl status listener in Windows Command Prompt I get the following:
C:\Windows\system32>lsnrctl status listener
LSNRCTL for 32-bit Windows: Version 11.2.0.2.0 - Production on 17-JAN-2013 23:07
:04
Copyright © 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 11.2.0.2.0 - Produ
ction
Start Date 17-JAN-2013 22:46:23
Uptime 0 days 0 hr. 20 min. 46 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Default Service XE
Listener Parameter File C:\oraclexe\app\oracle\product\11.2.0\server\network\a
dmin\listener.ora
Listener Log File C:\oraclexe\app\oracle\diag\tnslsnr\Rami-PC\listener\a
lert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=Rami-PC)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
Any ideas on what it could be? Please i am going nuts here trying to sort it out but I am not sure how to solve this problem and not being able to access my DB means i cannot really study for my ORA Fundamentals exam in March.
Thanks in advance

Answer 1

Here are the results from entering what you asked in windows command prompt:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\Rami>sqlplus / as sysdba shutdown abort startup
SQL*Plus: Release 11.2.0.2.0 Production
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Use SQL*Plus to execute SQL, PL/SQL and SQL*Plus statements.
Usage 1: sqlplus -H | -V
-H Displays the SQL*Plus version and the
usage help.
-V Displays the SQL*Plus version.
Usage 2: sqlplus [ [<option>] [{logon | /nolog}] [<start>] ]
<option> is: [-C <version>] [-L] [-M "<options>"] [-R <level>] [-S]
-C <version> Sets the compatibility of affected commands to the
version specified by <version>. The version has
the form "x.y[.z]". For example, -C 10.2.0
-L Attempts to log on just once, instead of
reprompting on error.
-M "<options>" Sets automatic HTML markup of output. The options
have the form:
HTML ON [HEAD text] [BODY text] [TABLE text]
[ENTMAP {ON|OFF}] [SPOOL {ON|OFF}] [PRE[FORMAT] ON]
-R <level> Sets restricted mode to disable SQL*Plus commands
that interact with the file system. The level can
be 1, 2 or 3. The most restrictive is -R 3 which
disables all user commands interacting with the
file system.
-S Sets silent mode which suppresses the display of
the SQL*Plus banner, prompts, and echoing of
commands.
<logon> is: {<username>[<password>][@<connect_identifier>] | / }
[AS {SYSDBA | SYSOPER | SYSASM}] [EDITION=value]
Specifies the database account username, password and connect
identifier for the database connection. Without a connect
identifier, SQL*Plus connects to the default database.
The AS SYSDBA, AS SYSOPER and AS SYSASM options are database
administration privileges.
<connect_identifier> can be in the form of Net Service Name
or Easy Connect.
@[<net_service_name> | [/]Host[:Port]/<service_name>]
<net_service_name> is a simple name for a service that resolves
to a connect descriptor.
Example: Connect to database using Net Service Name and the
database net service name is ORCL.
sqlplus myusername/mypassword@ORCL
Host specifies the host name or IP address of the database
server computer.
Port specifies the listening port on the database server.
<service_name> specifies the service name of the database you
want to access.
Example: Connect to database using Easy Connect and the
Service name is ORCL.
sqlplus myusername/mypassword@Host/ORCL
The /NOLOG option starts SQL*Plus without connecting to a
database.
The EDITION specifies the value for Session Edition.
<start> is: @<URL>|<filename>[.<ext>] [<parameter> ...]
Runs the specified SQL*Plus script from a web server (URL) or the
local file system (filename.ext) with specified parameters that
will be assigned to substitution variables in the script.
When SQL*Plus starts, and after CONNECT commands, the site profile
(e.g. $ORACLE_HOME/sqlplus/admin/glogin.sql) and the user profile
(e.g. login.sql in the working directory) are run. The files may
contain SQL*Plus commands.
Refer to the SQL*Plus User's Guide and Reference for more information.
C:\Users\Rami>