Either. Though personally preference would be XP.
The patch/optimizer
http://www.amd.com/us-en/assets/content_type/utilities/Setup.exe
Driver
http://www.amd.com/us-en/assets/content_type/utilities/setup.zip
You're welcome!
Oh yeah, rig, an oc'ed x2 3800 (2.8ghz), 2Gb ram, 7600gt, etc, etc.