Here's where I find account has Admin rights: in Safe Mode, log onto Admin account. Click on Start>Control Panel (Control Panel not available in regular user account)>User Accounts. I then see a screen with two rubrics. One says Pick a Task and I can click on "change an account" or I can get to the same place by going to the other rubric which says: or Pick an Account to Change. Under that rubric are four icons, one for each account set up on the computer. The Administrator icon, under which it says "computer administrator"; my father-in-law's user account icon, which also says "computer administrator"; my mother-in-law's user account icon which, also says "computer administrator"; and Guest account which is turned off. If I click on my father-in-law's icon, I can choose "What do you want to change?" and then click on "change account type." The account, however, is already designated as an administrator and that choice is grayed out. I can choose "limited account", whcih I have tried, and then put it back to administrator status, but it does not seem to effect the account when I boot up in normal mode. It still has no Admin rights. Whenever I try to do something that requires admin rights, I get a pop-up that says: "This operation has been cancelled due to restrictions in effect on this computer. Please contact your system administrator."
I do not know if UAC is on or not.