Hey Vilius,
I agree, this would be frustrating to me, also.
You'll need to set the user to have admin rights too, or network admin rights. I'm not too familiar with the process, but I do know there are several 'layers' of rights. Maybe one of our fantastic community can help further? We're not Microsoft accredited so couldn't advise a procedure.
Let us know how you get on!
Daz
eForum Team