I'm having a strange issue recently with my media pc ( its an old hp p4d 3.4 with a 6450 low profile in it) where it keeps randomly pulling up the entire screen with small green and clear squares across the whole thing, it recovers the driver and works but im wondering whether an earlier driver would be best or theres some other issue that anyone has seen before? It doesnt do it under any particular load, sometimes its just surfing the web, otherwise the cpu is working and im playing 720p video. Really cant think why its doing it so any help appreciated.