Oracle Database Discussions

Hello,

I am attempting to download and install Oracle 9I for Windows 2003 Server
on a 64bit AMD Dual-Core Opteron system. I downloaded from Oracle at:

http://www.oracle.com/technology/software/products/oracle9i/index.html

and chose:
Oracle9i Database Release 2 Enterprise/Standard/Personal/Client Edition
for Windows XP 2003/Windows Server 2003 (64-bit)

I get a message "setup.exe valid, but for machine type other than current"
when I try to install.

Are they any known issues with AMD, or do I not have a compatible version?
If this is not the one, could anyone provide a link for a working download?

Many thanks!
Chris