Greetings,
I have had the same problem and thought this solution did not work for me (I am a Windows 10 Home user). I followed the suggestion indicated above and got the problem: You are not an administrator.
The solution was, as you indicated, that I had to indicate that the prompt should be run as an administrator. When I ticked that, the solution was solved.
Thanks a lot.
In case it will help kristvi, the following does not work:
takeown /F "full bane til mappe eller stasjon" /A /R /D Y
Instead I used the following command
takeown /F "E:\FamilyDocuments\Roy\_Studio 2015\SDL MultiTerm\Telelingua" /A /R /D Y
It seems kristiv, in other words, did not replace "full bane til mappe eller stasjon" with the actual path of the folder she is interested in.
I hope that solves it. It seems to have solved it in my case at least.