Here's the driver link for the A4tech PK-635 Web Cam: http://www.a4tech.com/download%20driver.asp?cmodnum=PK-635
Click on the Driver for PC on the left pane to download the driver. Follow the directions on the website to install the driver.
Good luck, thanks for using FixYa, and please post back to this solution if you have any difficulties.
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