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gpu unable to start (code 10)

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Jan 2, 2010
i have 2 gpu's ati hd 4850 in my alienware m17 laptop. when i first got the laptop i had windows vista 64bit. i have now upgraded to windows 7 64bit. since upgrading one of my graphics cards have stopped working in windows device manager it says "device unable to start (code 10)" also in my catalyst control centre drop down menu it only recognises 1 gpu and not the other there is no setting for crossfire either. where as on vista the catalyst centre i had, had a tab where i could enable or disable crossfire. if any1 could suggest a reason why the device "won't start" i would appreciate it.

Thank You