I have problems running Quake2 under XP. The game seems to be running fine.... then it'll just hang up the PC. and I'm forced to reboot. Sometimes the sound will just stop and the game continues as if there is nothing wrong (without sound). It does one of these two things.... never both at the same time. Hell sometimes you can play for an hour without a hitch, sometimes it locks up (or the sound goes) after a few minutes. Everything worked fine under W2K..... damned XP!!