|I don't think you are doing anything wrong.|
Make sure you get that command line exactly right (no extra spaces or whatever).
I meant the command at #5 on there.
The "first response" in the thread says c:windowssystem32restorerstrui.exe but that is wrong (no backslashes).
It should be c:\windows\system32\restore\rstrui.exe
(another valid variant of the original command)
Always pop back and let us know the outcome - thanks