I have a Visiontek ATI Radeon HD 2600 XT 512MB GDDR3, AGP 8x, in my backup rig. It was a show stopper as far as windows 7 was concerned. ATI doesn't seem to want to support the AGP versions of these cards so update drivers
are a pain to find. 9.7 XP NW is the latest I have saved to disk. Not sure if I got them from Visiontek or after hunting around on the ATI site. I couldn't use them anyway and let windows 7 look online for drivers. It did find some and installed them but after the reboot they didn't work and device manager showed some error number that I can't remember at this time. I gave up and went back to XP on that PC. From looking at that link posted ATI have newer modded drivers so I will definitely download them and have a look. I'll be watching this thread to see if you get your 2600 working. I wish you good luck.