I tell you there is nothing like another stick of 256mb of ram to give you a sigh of relief. I had in the past some problems with a few games. For example some of the Quake 3 based games like RTCW and the Allied Assault demo.
If I ran these game with everything set to high I’d get some stuttering and shit like that. And that shouldn’t happen. Not with my rig. So I slapped more ram and bingo. Man that Windows XP is a hungry bitch.