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
Hi Ran into your problem, solution is get a copy of 10204_vista_w2k8_x64_production_client.zip (http://www.oracle.com/technetwork/database/10204-winx64-vista-win2k8-082253.html) run this & it will install the client.
Unpack ODAC10203x64.zip then go to All Programs->OracleHome->Oracle Installation Products & run the Universal Installer. When the installer runs at the Specify Source Location browse to the Stage directory created when you unpacked ODAC10203x64.zip then install as normal.
There is a ODAC112012.zip but this will not talk to Oracle 9 dB's so the above will resolve talking to legacy dB's.