I believe they were trying to remove upper/lowerfilters and reset 26 value related to the network.
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:

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