Need help with Screen Error

[Charles321]

I am having a screen error, where old images are staying on my screen...the images sort of stack on top of each.
I wish i could attach an image to show you...but can anybody explain to me why it is occurring.

FYI: Yes i know if i restart the comp it will go away...tell me what i dont know...what causes it?
I am running:
Intel Q9550;
4gb Ram
OS= 7-64bit Pro

 

[Guest]

Sounds like an issue with the video card (perhaps card's onboard memory failure).