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Here is the driver from A4Tech website for your A4tech PK-635 web camera. Works with Win98, Windows 2000/XP/Vista/Win 7 http://www.a4tech.com/downloads.asp Just put in PK and 635 and then GO, then on the left side click Driver for PC to download the driver for it.
Did you try uninstalling the webcam device in the Device Manager? Or try reinstalling the drivers. If it is only the display that is not working, but the sound is, it could also help if you reinstalled DirectX. Further webcam troublshooting ideas here.