There's some stuff you have to be logged in as actual "Administrator." Log out under your current user name, at the welcome screen hit ctrl+alt+del twice to bring up the classic logon, type in the name "administrator" and your administrator password. that should allow you to install it. you can then log out and back in under your user name.
EP, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS