I have a GEFORCE 7300 GTOC graphics card in my XP computer. As soon as it boots to the operating system, or a few minutes later I lose my video signal. The computer, however, seems to be running. I already swapped the monitor to no avail. If it's not my graphics card, could it be a virus? If so, is there any way I could possibly fix it given the fact that I may lose my video signal at any moment? Any ideas would be appreciated. Thank you.