Hmmm....To figure out what video card you have:

(right-click) My Computer >> Properties >> hardware (tab) >> Device Manager >> *expand* Display Adapter. It should say under display adapter what video card you have.

Is this computer completely up to date with all drivers?? Just be sure of that.

You also might want to make sure everything is up-to-date with Virus Scans and spyware/adware scans. Also try a disk defrag, and then do a scan disk.