Since updating from Win 7 to Window 10 - I have 'lost' the appropriate user name in C:\users.
Therefore when trying to set 2 other computers to recognise this particular laptop is not possible. My account is Local, and the network is private.
A visit to C:\users shows the following..........

Obviously I can see in UAC what the username is supposed to be, and I know the password - however inputting that info does not work. (The other 2 PC's run on Win 7.)
Your thoughts and help would be appreciated.