I don't know what you mean by 'GS' or how it performed a system "wipe".
The worst they could do is format your hard drive, re-load the operating system and restore a backup of your files. Once done, Windows will automatically start updating itself to the current version. Your video card's driver may need to be updated or installed if it is an add-on (if you're using a laptop, this will not be the case).
You could try opening Windows Device Manager (from Vista forward, just tap the Windows Start button and enter "Device Manager") and right-click on your video card's listing in the popup window.
Of course, if you do not see a specific driver for your video card, then you'll have to find one and install it.
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