Method 1:
I would first suggest you to remove all the external devices connected to your computer and try the steps given below.
Note: Ghost devices are the previously installed devices which are not connected but the drivers for that device is still present in the computer and sometimes shows in the devices list.
To get rid of unwanted drivers, devices, or services, use the following steps:
1.Open the Start menu.
2.Swipe to the upper right corner to bring charm bar.
3.Type cmd in search box.
4.Select cmd from the displayed list, right click and Open as administrator.
5.At the command prompt, type in set devmgr_show_nonpresent_devices=1 and press Enter.
6.(Note that nothing seems to happen. This is expected. You are actually setting an environment variable which is going to help you to see hidden devices.)
7.On the next command prompt line, type devmgmt.msc and press Enter. This will launch the Windows Device Manager Console.
8.In the Device Manager Console, from the View menu, select Show Hidden Devices.
As you expand the different drivers and devices in the device manager, you will see not only the items that Windows currently detects as installed on your PC; but you will also see drivers, devices, and services which have been loaded in the past but were not uninstalled or are not currently started. You can find your offending device, right-click, and choose uninstall to remove it from the system completely.
Note that ghost devices, drivers, and services are ?grayed? out, but that does not necessarily mean that you should delete all of them. Only remove items you know you do not need. Be careful that you do not change too many devices.
Once you have removed the ghost drivers completely from the system, try to reinstall the drivers for the Webcam and check if it helps.