I am not pleased. I have been running xp for years, I just bought a 5870 and installed windows 7 rc 64 bit. I used the drivers from ati site for the 5870. Diablo II locks up at times. Call of duty 4 will not play in multiplayer mode, only single player. I tried drivers from the cd, same thing. I would go back to xp, but I see there is no xp driver for the 5870. This is lame, and I am not sure who is at fault, windows 7, or ati. I like upgrading so that the 2 games I play, don't work on my new fancy hardware and OS.