At a Loss Advice/Help Needed

I've got a 7811FX which i've had since day one. It's worked quite well for a long time but recently it's been giving me a weird problem...

I've attached a photo of the issue as it doesn't appear in screenshots.

Whenever I open Itunes, or play a game my computer starts to display yellow lines all across the screen. This can be replicated time and time again.

In order to solve the issue I uninstalled the driver and then updated to the most recent driver... no luck

reinstalled the operating system... no luck

I do not have any external monitor to test to see if the problem occurs on an external or just the laptop's screen.

Again the issue only occurs when playing a taxing game (Civ 5, Fallout NV) or when i Open itunes.

Upon a system restart the issue is resolved... until next time.

I'm not sure if it's a graphic card issue or a screen issue.

MAX temp load recorded is 78 C so i don't think over heating is an issue. Used compressed air to clear the heatsink and fans.... st

I'm scratching my head here so any advice would be appreciated.

 

Have you tried once this occurs to reset to a default windows 7 theme?