Er, yeah, that's not good. It's possible they're using a self-signed certificate or something -- if going to the non-encrypted version of the site (take the 's' off the "https://..." I mean) doesn't cause a warning, it's something silly like that. If it's an actual virus warning or something or it still happens, definitely shouldn't be going there...I don't see how it can be on the Tor network only though. It's in the .com top level domain, it's not an onion site -- should be able to get there from anywhere. Well, whatever.