When I tried to install my old Logitech QuickCam Messenger on laptop running Windows Vista it found 2 out of 3 drivers. I downloaded latest QuickCam software from Logitech and installed it but that didn't help. I still couldn't use the camera.
Fortunately there is a hack to use Windows XP driver and my problem was solved.
Instructions: Trick to Use Logitech QuickCam Messenger in Windows Vista