ODBC 10.2 test connection success but MSAccess/Office throws ORA-12154

I've run into a difficult-to-solve problem. I'm troubleshooting an MSAccess to Oracle connection via Oracle ODBC driver issue.
MSAccess was giving ORA "long" datatype error (can't remember error number) when using 11.2.1 driver against a years-old, tried-n-true app that was previously well behaved (only diff is use of that app with newer Oracle ODBC driver). Web search revealed problems with 11.2 ODBC driver and MSOffice tools so decided to swith to older ODBC driver. Had 10.2 ODBC driver also installed so switched to that. Now get ORA-12154 every time I try to connect with MSAccess via Oracle ODBC. Using the ODBC Admin (32 bit) allows SUCCESSFUL connection as does tnsping & other tools that use Oracle Net. Only MSAccess (or other MSOffice tools) do not.
I've verified no other tnsnames.ora files or sqlnet.ora files available and have even gone as far as completely removing all things Oracle from the PC and reinstalling only the 10.2 client (custom mode; installed only the Oracle NET and ODBC 10.2 driver). I've turned on tracing to ADMIN level and read the trace files. trace for MSAccess call vs trace for ODBC administrator call yields nearly identical trace files till "niotns" step where the ODBC admin proceeds to connect and the MSAccess call just gives a few other coments then stops. NO apparent error messages. tnsnames IS found so don't understand why giving ORA-12154.
All tools connect (tnsping works, SQL*Plus connects, ODBC admin test sucessful, TOAD connects) EXCEPT MSAccess. Problem is I have many, many MSAccess legacy apps/tools and cannot go without the fully working ODBC connection between MSAccess and Oracle.
Help... desparate for new ideas to try since I've spent many hours searching and tried all known troubleshooting steps.
Any ideas appreciated.
Thanks,
Mike

Hi Mike,
I have a similar error. I can connect to database with TNSPING, and I can also connect with SQL Developer. But I am unable to connect with Access using ODBC, I get ORA-12154 error. Am also completely stumped. So if anyone can help, I would appreciate it too.
(P.S. I have tried on a number of PCs here in the office, on one PC I have here I can connect using Access and ODBC, I can see the tables, I pick on a table, it says "linking", but it never links - it just hangs forever.)
Thanks for any pointers,
Tom

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ODBC test connection success but MSAccess throws ORA-12154

My system details are,
OS - Windows 7 - 64 bit
MS-Office 2010 - 32 bit (Installed in "C:\Program Files (x86)\Microsoft Office")
Oracle server/client 10.2 (Installed in "C:\oracle\product\10.2.0\client_1")
I can "successfully" create the ODBC connection to my oracle database via "C:\Windows\SysWOW64\odbcad32.exe" (As my MS-Access in 32 bit, i need to use 32 bit ODBC component).
But, when I try to create/use the same in MSAccess -> External Data -> ODBC Database, I am getting the error "ORA-12154 TNS:could not resolve the connect identifier specified".
After spending couple of hours with debugging utilities, found the issue is in MS-Office installation path. The special character in the path "(x86)" is causing ORA-12154 error.
To ensure the same; I installed the Toad in "Program Files (x86)" folder, and tried connecting the same database. As expected, toad also gave ORA-12154 error (Which was working well in "C:\Toad").
Can you please let me know, is there a way/work around, we can make MSAccess 32 bit-> ODBC 32 -> Oracle 10.2 connectivity work in Windows 64 bit OS?
We cannot ask the end users to change the installation location of their MS Office from "Program Files (x86)".
Please let me know if you need more information.
Thanks,

I have the same issue.
I set up a DSN using Microsoft ODBC Administrator and I tested the connection.
However, when I tried using the DSN from Access, I get the above error.
Anybody listening?
venki

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-
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[WARNING] Some problems were encountered while building the effective model for Maven-Test:Maven-Test:pom:0.0.1-SNAPSHOT
[WARNING] 'dependencies.dependency.systemPath' for Maven-Test:Maven-Test:jar should use a variable instead of a hard-coded path C:/dev/hanacloud.sdk/1.48.16 @ line 16, column 14
[WARNING] 'dependencies.dependency.systemPath' for Maven-Test:Maven-Test:jar should use a variable instead of a hard-coded path C:/dev/eclipse @ line 25, column 15
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: Maven-Test:Maven-Test:jar -> version 1.48.16 vs 1.18.8 @ line 20, column 14
[WARNING] 'dependencies.dependency.systemPath' for Maven-Test:Maven-Test:jar refers to a non-existing file C:\dev\eclipse @ line 25, column 15
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
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[WARNING]
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[INFO] ------------------------------------------------------------------------
[INFO] Building Maven-Test 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.4.1/maven-clean-plugin-2.4.1.pom
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.4.1/maven-clean-plugin-2.4.1.pom (5 KB at 4.3 KB/sec)
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[INFO] ------------------------------------------------------------------------
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ODBC 10.2 test connection success but MSAccess/Office throws ORA-12154

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