I, like many, have a NVidia card. Some time ago NVidia offered a driver for Windows8. Even, after grabbing that, I continued to have video occasional vid issues. Ergo, I would check Update Driver & be told it was a good as could be. Was getting some hiccups, again, today & checked, again. This time Win8 ran off searching and this time found, DLed & installed driver software. Things, so far, seem better now. If, this applies to you, you might care to investigate for yourself, also. I'm talking about via Device Mgr.

Cheers,
Drew