After updating to Mountain Lion- built in camera is no longer recognized

i have updated my software from lion to mountain lion on my 2010-2011 macbook pro; as soon as the update completed my macbook no longer recognized the built-in camera. i checked the support site for the error "there is no conceted camera" and followed all the steps. it seems that i have no USB tab in the utilities folder; restarting and shutting down my macbook didnt help either. i am not sure if the necessary drives for isight somehow erased during the update. any suggestions?

Tried resetting SMC ?
http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".

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