i tried two different ones and it doesnt find them in msn i installed the drivers too and nothing...also one of them used to work so i bought the second one thinking the first was faulty but nothing.....
i use win xp pro

a friend of mine had this problem.... make sure you have the latest drivers installed. also check that the camera is being recognized in the
"scanners and Cameras" folder in the control panel. i can't see any other reason why the camera should stop working suddenly. if you're still having the problem reinstall everything from scratch making sure the device is being recognized in the control panel as this was the problem my friend was having.