XP is the best MS O/S, couldnt stand the thought of even going back to Win 2000/98. I actually had alot of Video card errors/BSOD on one my systems when I first installed XP system would only run after I disabled all 3D acceleration, so I went out and got a good KT266A mobo and havent had a problem since I know that alot of errors from Nvidia cards were due to a problem/conflict with the KT133 boards running under XP