Soldato
Well that was odd, just opened a website on FF, and my whole screen just corrupted, got horizontal multicoloured lines all over it, i could still see my desktop behind it though, so i pressed CTRl+ALT+DEL to bring up the Blue Task Manager menu screen, and it came on fine, corruption just vanished, screen just went back to normal, so i just presssed ESC to get back to the desktop, and that also came back fine, strange.
Probably a driver bug. Nothing to worry about.