This works for XP or Vista I have a Visiontek HD 2600 XT AGP and found none of the ATI driver packages will recognize my card so have been stuck with only two driver sets bad and worse. Then I found this over at the AVS HTPC forum that a couple of the guys there came up with and it works great. Download the set you want to test (I used the 7.12's) then do a complete uninstall of the old drivers, reboot, and start the install of the new drivers and let it unpack it self to the C:\ATI directory then when it starts the second phase to install the driver and CCC cancel. Next go here and follow these instructions to alter three .ini files one it the XPinf folder then two in the main driver folder; http://home.comcast.net/~exdeus/ati-hd2x00/#details After you make the changes run setup in the main folder and it should now find your 24/2600 AGP card, reboot when finished. Next you can apply the tweaks on that page for HD DVD/BD playback performance enhancements if you wish, reboot again, and enjoy. This worked great for me I could only use two modded driver sets from Visiontek 7.6 and 7.11 both gave me strange red jagged streaks on the 2D desktop and very poor PQ watching HDDVD. Now I have no 2D problems and after installing the tweaks listed on that site my HD DVD PQ is excellent,I even went up 22 points on 3DMark 06.