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MSDAORA doesnt have a 64 bit version. You'll need to either switch the app to 32 bit and use a 32 bit Oracle client, or use a 64 bit client and oledb provider instead (Ie, Oracle's provider - ORAOLEDB.ORACLE)
Hope it helps,
thanks for your answer. I downloaded the oracle provider set and changed it in my source code. now it works.
Can you give me the link where you download and how you changed
You can download from here: http://www.oracle.com/technetwork/database/windows/downloads/index-090165.html
The simplest change is in the connection string for your application. If you're lucky, no other changes will be required. Need to do testing to verify that for your code though. :)