Thanks alot mate for your time!
I have been testing this card all weekend and found to have mixed resualts working then not working.
Did find after fresh insall of Win 7 64Bit with just hardware drivers and no updates on that all games worked ok but still now and then got the Driver not reponding error in windows.
After i installed windows updates i had big problems again and found that update KB976902 would make my PC crash and also stop the Graphics card from working even when trying to boot from cold.
Would get a BSOD when booting from cold then after a restart it would boot into windows.
I have had enough of this and think that it has to be an intermitant fault so going to RMA the card off on monday and see what they say.
Cheers mate