I'm assuming that you have tried a different USB socked with the same result. This has nothing to do with the software, it's a hardware fault. You can check that simply by booting from a Linux Live-Cd and see if the webcam is recognized. Most likely it has just failed.
This is unfixable, you will have to buy a new one.
1st You download Webcam Driver.
Drivers
After this install the Webcam driver in the system.
Installation of Webcam Driver
Go to the control panel
Click on the System Icon
Click on the Hardware Tab
Click on the Device Manager s
Select the Unknown Device or printer device where yellow Question Marks sign on it.
Right click on it and uninstall it.
After this go to the top of the device manager and click on scan for hardware changes.
Driver installation Wizard start.
Brows Your Driver from the Hard Disk and click on next.
Driver will be install.
Microsoft Camera Drivers for Windows XP Vista Windows 7
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