Crap. Now I HAVE to tell our IT guy. Hope they don't take my computer away for letting it get almost-I hope-infected.
You can run but you can't hide from us evil IT guys muahahaha
Try logging in with username: Administrator and no password. If your IT guys are lazy this will work. BUT you don't really have to go to the Safe Mode to do that. Are you running XP? If so just go to Start-All Programs-Accessories-Systems Tools-System Restore - check to see how many restore points are available and pick the one you think will be the pre-infection one. Keep in mind anything you did since then will be lost.
Was the popup just a web-browser popup window? If so they're almost always fake. But since you said you couldn't X out then it may not have been. Just let your IT guy fix it for you? We love to help girls out...especially the recently single ones LOL!
Me: 35|WAW: 38|D: 6yo | http://tinyurl.com/2dxx7m6 Feb 2006, left, came back in two weeks Aug 2006, left again Apr 2007, filed for divorce Dec 2007, reunited Mar 2010, moved out, filed again