fix Windows 10 update install errors 80070643 KB3081424 KB3081704 and similar error codes

This is the format of the error while trying to install this Windows 10 update:
  Update for Windows 10 for x64-based Systems (KB3081704) – Error 0x80070643
 Here are the easy steps to fix it:
1.Click Start >> Type “regedit” in the search bar >> Press enter
2.Scroll down and locate this registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\…
Control\BackupRestore\FilesNotToBackup
3.If you cannot find the “FilesNotToBackup” subkey you have to add it. To do this:
•Right click on Backup Restore >> Select “New” >> Click “Key”
•Type FilesNotToBackup >> Press Enter
4.If FilesNotToBackup is already there, close regedit
5.Click Start >> Type services.msc >> Click OK
6.Double click Background Intelligent Transfer Service
7.Under the General tab, Click Start.
Note: If it’s already on start, click stop and then again click start)
Now your Windows 10 update will be successfully installed. You can use the same method if you get similar update errors in the future. This method also solved error code 0X80246008.