Hi,
I would suggest you to refer the link below, which would help you to install the drivers in your system.
http://www.logitech.com/en-us/435/217
I would suggest you to install the Logitech quickcam drivers designed for Windows 7. Most of the times the drivers designed for Windows Vista should work on Windows 7. If the device is not working, then you need to install the driver for Windows 7.