UAC won't let me create standard account

[Guest LRGiles]

I got my new computer a couple of days ago, and created an administrator

account immediately (i'm logged into it now). I keep trying to create a

standard account for my wife, but when I click on the Add/Remove Account link

nothing happens. There's a windows shield next to it, so I expected to be

prompted for my adminstrator password. Again, nothing happens. What am I

doing wronge here?