UPDATE: I downloaded the driver from Logitech and still no luck! Camera refuses to connect. The green light flashes occasionally, taunting me, but won't work.
I have been having problems. Don't know how long it was happening though...just upgraded my processor. I rarely use my webcam nowadays since I have a concubine at home

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I was noticing a beep on shutdown, searching showed it was probably the quickcam. Killing the processess and shutting down without a beep confirmed it.
I had to uinstall to my old quickcam software to failure, then delete the deldev.exe file from the bin subdirectory in the install directory and do it again...then just run setup after a reboot.
However, although my camera works...I get a beep whenever I shutdown (windows default beep).
This is a popular topic, searching uninstalling quickcam, papp quickcam error, -5001 quickcam error, etc will show many are having problems.