graphic card not detected!

I refreshed my windows 8 after some problems. After installing most drivers including the gpu ones, while trying to go to the nvidia properties it says graphic card not detected in system :O

this is the first time it is happening what do I do?
GT555M M14xR1

edit: ok its fine now, apparently restarting not once or twice but four times is the solution!
really did freak out a littl (phew!!)
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