When I try and play counterstrike source or call of duty 4 my screen will have all these red dots and get really pixely. The game shuts down and then I have to restart my computer. I cleaned A LOT of dust out of my videocard thinking that it might be overheating or something but so far as I retry it still does the same thing. This is definitely a videocard issue right? I still get some red dots even on my desktop but not a lot. Just wondering if there is anything else I can do. My card is a radeon x800xl 256mb in case anyone wanted to know...kinda old school ha. anyways thanks in advance for any advice.