Guest account no admin rights

Hi, I bought a laptop withWindows 8.1 for my wife and thought I would set it up with a guestaccount and then change it a normal user account after it was up andrunning. Unfortunately, I had not realised just how restricted theuser accounts are compared with W7. So, my problem is thatwith this guest account I cannot do anything to create a normal useror admin account. I have spent hours and...