Thanks for looking into this Dolby and Shirik.
To answer a couple things in case the info is relevant:
WoW is currently installed in my Public Folder, Vista 32-bit. The UAC pops up randomly on application loads. Sometimes it does, and sometimes it doesn't. Most of the time it pops up on a Progressive Insurance ad, and an ad for Carrie Underwood music videos, but a couple others have triggered it as well. I don't remember what they were off the top of my head. I cancel it out every time, so I don't know what it tries to run.
My default browser is Chrome. I switched to it about two weeks ago, after using Firefox for about three years. I hardly touch IE with a ten foot pole.
As for recording the detailed info from the UAC prompt, how would I go about that? Do I need to let it run? If the ad is trying to run an exploit, I'm a little hesitant to allow it.