Helping people with computers... one answer at a time.
There is no way to rename the administrator account. Windows doesn't work that way.
I purchased a desktop, HP Pavilion with Win 7 from a soldier being deployed to Afghanistan who needed the money to purchase an iPad. I've added myself as the new administrator, but in every instance where my name appears, it's linked with his. Additionally, in certain tasks, I can't complete it without his authorization! I've tried a remove from ACE (Access Control Entry) and from ACL (Access Control List) with no success. What's the magic bullet?
In this excerpt from Answercast #64, I look at a second-hand machine that has blocked administrator access.
You're not going to like the magic bullet. The magic bullet is to reformat and reinstall Windows from scratch on that machine.
It really is the only safe way to take over a machine that formally belonged to someone else. Unfortunately, that's just the reality of it.
There is no way for example to rename the administrator account; or rename what you'll find on the hard disk for a previously existing account. Windows doesn't work that way.
You can create new accounts if you need to and give them new names - but that will not take over the stuff that's existing on that machine. You can even make new accounts and make them the administrator on that machine - but that doesn't change the previously existing accounts and some of the kinds of issues that you're seeing.
So, what I strongly recommend (and it's something that I recommend whenever anybody gets a used machine) is that you reformat and reinstall Windows from scratch.
I have an article on it, "How do I gain administrative access to a second-hand computer?" That is basically what it's going to tell you. The safest thing to do (both for your protection and for the previous owner's) is to completely erase that machine and start over from scratch.
Now. If for whatever reason, that is not what you want to do: you want to basically ignore that advice (and I kind of understand why people might want to, because it is a fair amount of work), the other thing you can do is to take over the true administrator account on that machine.
Then I would send you to an article on my site that has step-by-step instructions on how to do that called, "How do I retrieve my Windows administrator password if I forgot it?"
What that does is:
That will have you download a utility that you will burn on to CD.
Then you will boot this machine from that CD.
Then you will be able to reset the actual administrator password and become the true administrator on that machine immediately, and then do whatever you need to do.
As I said, you're probably tired of hearing me say this, I don't recommend it because there's just so much stuff about that machine that you don't know: you don't what's on it; you don't know what malware may be on it; you just don't know! There's so much you don't know about that machine... that I strongly recommend that you reformat it and reinstall from scratch instead.
Next from Answercast 64 - My printer prints things too small. What can I do?
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