[Ibonic]

I messed around a bit and found a way to duplicate that problem (assuming you have direct 3d enabled and all of the newest drivers etc.), so maybe this will help..

right click on your desktop, click properties, go to the settings tab, click advanced, and go to the troubleshoot tab ... or you can get to the same window through control panel's system->device manager

check if hardware acceleration for your video device is set to "full" (it should be)

sorry if it doesn't