WHen i play diablo 3 on online with a group or by myself the floorbase is kinda missing in spots and my screen gets scratchy really really badly and i have to his my windows button to get it to go away for a bit to see anyone have any ideas or having the same problem that got fixed please let me know.

BTW i am runnning
Windows XP HP PROBOOK 4425s
ATI Mobility 4200 series (which is not covered on supported or not and i have updated to the newest driver)