Toshiba Satellite Pro?

My Toshiba Satellite Pro U300 has a problem! the display keeps going crazy, the Icons double in size and then a message comes up " The igxprd 32 display driver has stopped working normally" after re-starting it works normally for a while.

The fault occurs at any time from initial start up to being on for many hours, so I don't think it is a heat problem?

I have re-loaded the latest display driver from the Toshiba site and this has'nt had any effect, the only time it seems to happen less is when I use it on just battery power.

It's running Win XPpro (service pack 3) 80gb hdd 2gb ram, the display is set to 1280x 800 32 bit colour.

Anyone got any idea's as it's driving me mad!! as it always seems to happen at the most inconvenient time! I have missed out on several ebay bids when it occurs!!

Thank you