There's a quick test you can run to eliminate a graphics card issue.
First is to open the control panel, its pinned to the Metro menu if you choose to show all apps.Second from the control panel choose, Display, then change display settings, then advanced settings, then properties, then driver, then driver details.......Check to see if your Nvidia driver is being used!..If it is, then disable it and choose another from the list that windows has.........Windows comes by default with about ten drivers and so you can try a process of elimination....... This may not solve it for you but it did for me because the current Radeon/ATI driver for windows 8 doesn't work..No surprises there knowing what a shoddy two bit company they are...
Most companies have been thinking laterally concerning windows 8 by updating their drivers asap, sadly, the graphics cards companies always lag behind even when there is no new OS to challenge.......They are in the game without too much competition from other developers and so slack on their obligations..

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