New Browser Hijack

I work for a company who consults to homes and small businesses for computer and network repair. Last night I was visiting a client who had a new type of Home Page hijack: This one took the about: blank and actually attached a website to it. The website is not listed in the Address Bar and Viewing Source does not provide too many clues either. No virus present and Spybot couldn't detect it either. This will take a little digging.