i´ve got some probs with my 6600 AGP,too.
After running Battlefield 2 for some minutes, there are heavy graphic bugs.
I tried different force wares including that one on the BF2 DVD (77.30) and even older ones. But the problem still appears.
I played with a radeon 9250 before and everything was fine. (except: resolution, lightfx, antialiasing, textures, shadows....
1 GB DDR Ram
ECS K7S5A (latestbios / sis vga drivers)
Game Theatre XP (ext.sound)
xp pro (latest updates)
BF2 (latest updates 1.12)
any idea ?