Thats quite a small image to work off. Are you on about the green sections?
I'll go through the normal procalls though.
1. Does it do it in any other games or applications?
2. uninstall drivers, boot to safe registry clean, reinstall.
3. If that is green. have you had any crashes recently in general, could be your ram, memtest it

4. Try a different connection on the back of your card. ive heard miracles happen...