halo434 0 Newbie Poster

everytime i play cod2 (just about) the game freezes at any point either on startup screen or in game. It freezes then the screen goes black and a small box with dvi written in it comes up in the corner when the image returns. at this point i cant mve mouse and no keyboard functions work, so i have to restart my machine. Last time this happened i got a blue xp screen come up saying something along the lines of you must restart your machine to prevent damage, etc... any ideas on solving this would be gr8! :)