I just upgraded my system to Windows XP Home a few weeks ago, and after installing the Q3A demo again, I am having a very annoying problem. The game seems to be very choppy -- I don't mean the framerate; I'm used to relatively low framerates on my GF2MX. It seems like the picture moves slightly every few seconds, kind of like the mouse adjusting. I don't know why this is happening, and it nearly ruins the whole game! Can someone tell me how to get out of this problem? I already tried COMPATIBILITY MODE for Windows 98, but the game wouldn't even load (I got one of those "error has occurred, send report to Microsoft" dialogs) when I did that.