It's very weird that it should single out one site, but it's got to be a Firewall / Browser security issue. Maybe the site has some sort of script running in the background, which your set up thinks might be a threat? Seems funny that everyone else can access it OK though. Have you tried contacting the Webmaster of the site? Oh, and have you tried a different browser, such as Firefox? I can access the site fine with Mozilla, of which Firefox is the stand alone browser component. Well, almost.