You didn't mention your computer make or model, but if you have a Intel chip (i3-i5) go to Intel support > here < and run the update tool. The chipset has been updated a couple of times regarding Win8.1. It can affect the graphics, so this is the first thing to try. And NM if you have a AMD processor.
Intel I7 960 @ 3.87ghz *Intel DX58SO *HIS HD6970 2gb *Corsair TX650M *2x4gb Corsair XMS3 *WD Black 1TB *Windows 7 Home Premium 64bit *Gateway HD2401 24" 2ms 1920x1200 ***Asus N71Jq laptop *Intel I7 720QM Processor *Mobility Radeon HD5730 1gb *8gb Ram *Windows 7 64bit
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12:03 AM by