Ok.. my computer I've had for about 6-8 months and up until about a week ago I have never had a problem with it. Basically I will be playing Dark Age of Camelot (DAOC) and the computer will lock up entirely. The amount of time seems to be completely random.. sometimes it's 5 minutes sometimes it goes all day without this happening.
So far I have tried.. new memory/new cpu/reloading windows XP/redoing all the drivers/windows xp SP2... and nothing has worked.
Also I haven't once experienced the computer crashing while not running the game. I also don't play any other games so I wouldnt' be able to tell you if it freezes in anything else or not.