its not a windows only problem, i have witnessed the same issue on my ubuntu 12.04... and the issue is not driver related, since i experience the same issue on stock drivers, latest, and all the versions in between them...
the issue seems to get worse / better from time to time... all the artifacts are gone for the moment... but i still see pixelated shadows, and a notisable difference in between Imp Pant watched from the screen and another device...
taken this webpage for example, I see 4 layers of pixelated shadows and the background of the rog logo not displaying correctly, there is a line of the background that goes all the way down to where the shadows end...
on the print screen on this notebook i see it exactly like i see it on the screen, but if i transfer it to another device i see it correctly...