In this thread, someone who has the same issue posted some pics
Hi guys, I am operating Windows 7 64 bit with a ATI Radeon HD5670. And recently, sometimes when I start games, my cursor will become distorted, and when I move it to places where the cursor would normally turn into, say the sign for where you are supposed to type something in, or the finger to click a button, it will just be a pixelated coloured or black box, or sometimes just a vertical line. All will be resolved with a reboot.
This was happening everytime I booted up a game last night, and today I ran fine for 6-7 hours before it happened again.
Does anyone have any clue what could be causing this? It is a 3 week old computer.