Edit: Some sort of IE7 hack/virus/attack? (sorry can't reply to your message for some reason)
http://i.imgur.com/r8u2I.png - screenshot is with adblock turned on, but I also tried it with it turned off and didn't get it.
Edit: Screenshot - http://i.imgur.com/5lnJ7.jpg
http://www.bleepingcomputer.com/combofix/how-to-use-combofix
Edit: There's no choice of browsers on this network. It's IE 7 or nothing.
http://sitecheck.sucuri.net/results/http://youthoughtwewould...