faulty update

This AM EST at 7 AM I failed at updating Windows 10 21H1 19043.1081. I am sorry I cannot remember the #. I tried everything including recovering an image to no avail. I tired about 6 times and it always said that red waning it was not good. Inexplicably, I ran windows update successfully, no...

It seems that the entire key and its subkeys of : [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv] has been deleted by a recent update somehow. I found a registry file to merg and it worked....HOWEVER, it found 2 updates, one is the security update for .netframe 3 and .NET 4...