Have you tried to go onto the "Secret" Admin account?
Im sure if you Google it, you will find lots of guides on how to do it
My first post on this forum. I have a computer with windows XP. The only user account on the computer is listed as "Limited". That is my problem. In order to do certain things you have to be a "Administrator". How can i change the "Limited" account to a "Administrator"? I have tried but it says you need to have another user who is a "administrator" make the change. Which is impossible since there is only one account on the system. I also can not add any new users to the computer. any help is greatly appreciated.