my video card is a nvidia geforce 5600 with 256. im almost positive my comp can handle it, its a pentium 4, 2._ ghz. its a vaio machine if that makes a difference. the drivers are all installed properly, i actually took it to a computer shop and had them install everything. everything is up to date, they cant seem to find the problem either. ive been told that it could be heat, but the fan works on the card and in the machine. temp isnt overly high either. any other ideas. finally, if not, what videocard to you suggest replacing this one with. im currently trying to play world of warcraft and half life 2. thanks.