Maybe this will work for you:
• Download the updated Chicony Webcam driver from
http://203.56.127.6/driver_download/Public//p2_all/ChiconyWebcam_v1.7.175.0123.exe
• Install Vista Service Pack 1, or Vista Hotfix KB934374:
http://support.microsoft.com/kb/934374 (KB934374 is included in SP1)
• Make sure that Skype is completely closed, and not sitting in the System Tray before the webcam software driver was not loaded.
• Try closing the Camera Assistant Bar on the left of the Desktop.
• To stop the Camera Assistant software from running on startup, run Regedit and delete "Camera Assistant Software" from HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Check it out