Apparently every site can “harm your computer,” even Google’s site itself.

Edit: And now it’s fixed.

While I do appreciate Google trying to keep us all safer on the internet (of course, when it’s working normally), I do think there needs to be a big asterisk at the end of every one of those warnings that should state “Only if you’re running Windows with IE as your browser.” Nearly all of these warned sites are IE exploits, so if you’re running basic precautions, like using Firefox, or not using Windows, generally it’s a moot point.