UAC doesn't give me a continue button - can't do anything as admin

I'm trying to get updates to a gaming program on my computer. The Vista UAC
pops up and tells me that a program needs my permission to continue, but the
dialogue box doesn't give me a continue button with which to continue. This
also happens when I try to manage another account or turn the UAC on or off
as well as some other administrative functions. This User Account is the
only one on the computer and is the administrator. This has lost me all
adminsitrative functionality! Windows is completely updated. How do I fix
this?