Flashing lines and boxes on my screen arrghh

Hello
Can anyone help?

In either XP or games my screen keeps changing to multi coloured lines and boxes. If I reboot it's OK but then it does it again.

I reinstalled my graphics driver and it was OK for a couple of weeks but now its started again.

I have a P4 3.06 Ghz, 1MB ram, Radion 9600XT (256MB) and Windows XP SP2.

:monkey:
 
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