muthyala_51, thanks for the extra detail, worked great!
I can add that, in my case:
It looks like my 11gR2 client is version 11.2.0.1.0. The ODAC version that I downloaded was 11.2.0.30 found here:
http://www.oracle.com/technetwork/database/windows/downloads/index-090165.html
For some reason, when I first navigated to the drivers page, I could find the x86 and the x64 client installs, but the ODAC links only pointed to the 32-bit drivers... had to search for the 64 bit flavor.