How do I upgrade to Windows 7 ultimate with out the admin password

I just recently (recently meaning a while ago) bought a Windows 7 Ultimate upgrade key, and I want to surprise a friend by upgrading his OS to Windows 7 Ultimate, but I do not know his administrator password. The only password I know of is an account he set up for me. Does anyone know how I can upgrade his OS without asking him for his administrator password? If it helps, he is currently using the Windows 7 Starter operating system. Thank you in advance. To clear up some confusion, the key was got when I bought the upgrade on his computer. I have marked this as solved because earlier when I went over to his house to help him with some maintenance around his house, I saw that his account was still open and upgraded his OS while he wasn't looking.

Great question. One you're going to have to ask elsewhere as no one here is going to answer it.

1) If you just bought a Key without accompanying software, then it's by definition counterfeit.
2) No-one here is allowed to tell you how to bypass security systems.

I doubt a machine with w7 Starter will run Ultimate anyway, the whole story, I think, is bogus.

IronWarMachine said:

I know that a key cannot be bought on its own. I bought the upgrade on my friends computer, and when it gave me the key, i tried to use it to upgrade his os but it wouldnt let me. Sorry for the confusion.

Does any of the above make sense to anyone? This guy is just full of stories that make no sense.