hello people. i have a question about my COMPUTER. for the last COUPLE months it has been locking up when i play games. i can do anything else and not lock up but it always locks up when i play a game. It all started when i put another 512 RAM into my computer, but then i took out and took back to the store. So now, im stuck with lock up. i dont know why it is doing it, i know there could be a "million" reasons, but could you guys tell me what you think?HMMM, i would have said that the ram sticks may not 'like' eachother but if the problem is persisting it is probably somthing else. you should start my removeing/ reinstalling important drivers such as video and sound.i just got a new 256 vid card, so those are reinstalled drivers. i dont think it is the OS or any FILES. i re-formated about a month or 2 ago. i think it is some kinda hardware prob. does RAM go bad after awhile?to test graphics in the run box TYPE dxdiag to test memory>http://www.memtest.org/how do i use that mem. thing, it does not tell me  :-/