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There are a few things you can try. First try using a different usb port if available on your computer. You said your friend bought the same webcam, if possible try your friends on your computer to see if your webcam is faulty. What version of windows are you using? Is your friend's the same?
The last thing I can think of is to ask if your windows is updated. Perhaps there is a generic driver that the web cam uses included in service pack 1 or 2. You should stay uptodate anyways for sercurity purposes. If that is not the case then it leadds me to believe that you might have a faulty web cam and should exchange it. Perhaps others will have some other ideas.