I doubt this has anything to do with McAfee and more to do with that registry cleaner you said you have used in your other thread. See if it has a restore setting and reverse what it did. Otherwise you are going to have to repair Windows and questions on that should go on a Windows forum.
However, as I stated in my other answer, you could contact Technical Support to see if they have any suggestions.
Peter already given the answer, it’s nothing to do with McAfee. But I have googled this issue and I found the below link with suggestions