I\'ve tried to install \"Oracle10g Release 2 ODAC (64-bit) 10.2.0.3 for Windows x64\" from: http://www.oracle.com/technology/software/tech/windows/odpnet/64-bit
I had unexpected crashes in my application using Instant Client 10.2.0.3 on Windows Server 2008 x64. After reading a few posts about the lack of support for this platform, I upgraded the client to 11.1.0.7 and it works like a charm !
So I would be surprised if ODP .NET 10.2.0.3 would be stable on Windows Server 2008 x64, if you ever managed to install it. IMHO, your options are :