Attached is a screen dump of my desktop. The strange blue marks that look vaguely like a Windows logo appeared a few days ago. I have tried viuss scans, Spybot, adaware etc. but the marks stay on every screen, changing colour to maintain contrast. They first appeared while I was in the middle of an online game, and I haven't been able to get rid of them since. It is not screen burn, as they move round the screen. They now seem to switch on on the windows load up screen Anyone able to confirm if this is a virus, or may be another problem?