Oracle Provider not Found

Good afternoon Oracle Forum members,
I'm having trouble on connecting a OraOLEDB.Oracle application to my Oracle Database 11g R2 (11.2.0.1.0), I have a Windows Server 2008 Enterprise machine running it.
Each time I try to connect it says: Oracle provider not found. It may be not properly installed.
I've searched many site and tried many things like:
-Registering DLLs manually using:
REGSVR32 "C:\Program Files\Common Files\System\Ole DB\sqloledb.dll"
REGSVR32 "C:\Program Files\Common Files\System\Ole DB\Oledb32.dll"
REGSVR32 "C:\Program Files\Common Files\System\Ole DB\Msdasql.dll"
REGSVR32 "C:\Program Files\Common Files\System\msadc\Msadce.dll"
REGSVR32 "C:\oracle\product\11.2.0\dbhome_1\BIN\oraoledb11.dll"
-Installing the client with ODAC112012 pack that comes with 32 bit features (but after it the database stops working properly.
-Installed the client with ODTwithODAC112012 (but after it the database stops working properly)
-Formatting and re-installing Win 2008 Server Enterprise, Oracle Database 11g R2 and all applications (did it more than 4 times)
-Changing the provider from OraOLEDB.Oracle to MSDAORA (results in "Unknown Provider" message)
Is there something I did wrong? Is there something else I have to do to make it work properly?
Thank you very much!
Edited by: K- on Oct 10, 2012 3:44 PM

I installed Oracle DAC 32-bits on the same machine, the provider was found successfully.

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