I can't speak for them, but it looks they might have been hijacked and the person who hijacked them was hosting malicious scripts on their server.
I do not recommend visiting a site that either your browser or norton implores you not to visit. heck even search engines are now displaying under the results what sites have been known to cause problems.
I got a nasty trojan on my computer 1 time and I had to take it to the shop and have it completely reinstalled. no fun at all