I believe they were trying to remove upper/lowerfilters and reset 26 value related to the network.
HKLM\SYSTEM\CurrentControlSet\Control\Nsi\{eb004a00-9b1a-11d4-9123-0050047759bc}\26
But that does not really help, the point is, they should not have restarted, unless they knew.

To restore background, run CMD as admin and copy/paste the code and enter:

Code:
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v "ForceActiveDesktopOn" /t REG_DWORD /d "0" /f
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v "NoActiveDesktop" /t REG_DWORD /d "1" /f
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v "NoActiveDesktopChanges" /t REG_DWORD /d "1" /f
taskkill /im explorer.exe /f & explorer.exe

But a repair upgrade would probably be the best option.

Repair Install Windows 10 with an In-place Upgrade Windows 10 Installation Upgrade Tutorials