G400s after update Windows 8.1 the webcam can't detect

Hello,recently i want use my webcam but I realize my webcam cannot use, it says can't detect my webcam!
Last time can use webcam no problem,but after update Windows 8.1 the webcam cannot use.
I have problem with my webcam lenovo g400s for windows 8 64bit. And I search and check many solution on website or google.It not work, and my device manage >imaging device dint have webcam camera list inside
and also I already download last the camera driver for Windows 8 on lenovo download website there ( download.lenovo.com /express/ddfm .html )after install it with error "Not Appropriate Driver to be installed. 
Please help

hi Rayman94,
Welcome to the Lenovo Forums.
Can you try the following:
  - Follow this guide on how to show hidden devices on the device manager. When done, look under Device Manager > Imaging Devices or Other Devices and see if you can now see the camera or an unknown device.
  - If you now see the Camera under Imaging Devices but is grayed out, try to right click on it > choose uninstall > delete the device driver then reboot the system. After the reboot, install the Camera Driver (AVC, Bison, Chicony, Lite-on) and observe.
  - If you still can't see the Camera under Imaging Devices but you see an Unknown Device,  follow this guide on how to identify it. Once identified, navigate to the C:\drivers\Camera Driver (AVC, Bison, Chicony, Lite-on)\HD folder and install the appropriate driver.
- Link to picture
Let me know how it goes.
Regards
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