Hi Md. I'm Greg, an installation specialist, 10 year Windows MVP, and Guardian Moderator here to help you.
I'll give you all possible fixes that are working for others for webcam problems. If you need help performing any steps I am standing by to help.
1) Try resetting the Camera app at Settings > Apps > Apps & Features > Camera > Advanced Options.
2) Did you enable the Privacy setting to allow apps to use your webcam?
https://www.top-password.com/blog/enable-disabl...
https://privacy.microsoft.com/en-us/windows-10-...
3) Try also these steps from Microsoft for when webcam isn't working:
https://support.microsoft.com/en-us/help/13753/...
4) Try the Hardware & Devices troubleshooter at Settings > Update & Security > Troubleshoot.
5) Try Updating the webcam driver from the PC or webcam maker's Support Downloads web page for your full model number, Serial Number, or Dell Service Tag number from sticker on PC.
Also compare all other drivers including Chipset, display, sound, etc to make sure you have the latest on the PC maker's Support Downloads web page.
Additionally on Webcam Driver tab see if Roll Back is available, if not try Update Driver, first Automatically, then Browse, then Let Me Pick to try all previously installed Drivers.
If these fail try to Uninstall the Driver, restart PC to reinstall.
6) If this was caused by Windows Updates then you can check which were installed at Settings>Update & Security>Windows Update under Installed Updates, then uninstall them from the link there, and hide with the Hide Updates tool explained here:
https://www.howtogeek.com/223864/how-to-uninsta...
You can also use System Restore to get before the problem began, then check for Updates with the Hide Update tool and hide them:
http://home.bt.com/tech-gadgets/computing/how-t...
7) If this was caused by a Version Update then you can roll it in Settings>Update & Security>Recovery and then hide it until it matures using the Hide Updates Tool explained here:
https://www.howtogeek.com/223864/how-to-uninsta...
8) Go over this checklist to make sure the install is set up correctly, optimized for best performance, and any needed repairs get done:
http://answers.microsoft.com/en-us/windows/wiki...
Start with Step 4 to turn off Startup freeloaders which can conflict and cause issues, then Step 7 to check for infection the most thorough way, then step 10 to check for damaged System Files. Then continue with the other steps to go over your install most thoroughly.
9) If nothing else helps you can run a Repair Install by installing the Media Creation Tool and choosing from it to Upgrade Now. This reinstalls Windows in about an hour while saving your files, apps and most settings, solves many problems while also bringing it up to the latest version which you need anyway and by the most stable method.
http://windows.microsoft.com/en-us/windows-10/m...
This is the most stable way to change to the newer version and because it reinstalls WIndows while keeping your files and programs in place, fixes most problems. It also brings all Windows Updates to date.
If there are any hurdles during install then these steps can overcome them:
http://answers.microsoft.com/en-us/windows/wiki...
I hope this helps. Feel free to ask back any questions and keep me posted. If you'll wait to rate whether my post helped you, I will keep working with you until it's resolved.
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Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.
