How to disable pre-launching and pre-loading so CCleaner can fully clean Edge

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\MicrosoftEdge\Main ... MicrosoftEdge\Main was not there ! I looked for both you suggested nether were there . Hows that for trying . so why would Edge not be in the registry , where you said to look for it ?

That is correct, because there is no default policy for Edge. You must add the registry keys and values yourself.

Please read the following post: