Logitech webcam not working?

OK, so I got my hair done and it looks absolutley pretty and I wanted to take a photo of it. I pressed my Logitech webcam symbol, and it showed that task bar in the side. I press quick capture and it says " Your webcam isn't plugged in, or not working properly." the it says " reconnect" I... show more OK, so I got my hair done and it looks absolutley pretty and I wanted to take a photo of it. I pressed my Logitech webcam symbol, and it showed that task bar in the side. I press quick capture and it says " Your webcam isn't plugged in, or not working properly." the it says " reconnect" I tried it didn't work. My webcam WAS plugged in and it worked yesterday. please help! If it helps I have a windows vista and a Logitech quick cam c100 or something like that.
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