reg delete "HKCU\Software\Classes\CLSID\86ca1aa0-34aa-4e8b-a509-50c905bae2a2" /f GUI instead?
That specific GUID—86ca1aa0-34aa-4e8b-a509-50c905bae2a2—is known in practice as the class identifier used by Windows for a Shell component interface (see below for practical implications). Setting the InprocServer32 default to an empty string at the per-user Classes\CLSID path effectively disables or redirects how COM activation resolves that class for the current user, because Windows looks at InprocServer32 to find the DLL in-process server to load for that COM object.