Windows 8 artifacts

[Rich]

Got a USB monitor, works fine with Windows 7 and latest driver. In Windows 8 there are artifacts that appear sometimes, exactly like artifacts caused by too much GFX overclocking i.e. polygons stretching for miles and objects becoming very distorted.

Tried many things, unistalled the displaylink driver and there are no artifacts. I have a surround setup but it produces artifacts even in windowed mode on a single screen. Hope you can fix it as I prefer Windows 8.