I've been assigned to set up a PC that has Windows 7. It's been used before but I do not know by who or how it was used. In order to do some of the setting up I want to do, I need access to the Administrator account. I have an account that's in the Administrator group, Admin, but the Administrator account itself appears to be hidden or missing. It does not appear when I boot into safe mode. How can I gain access to Administrator?