thats one of the reasons i dont use/trust antivirus softwares. The site is perfectly alright but your software is giving you false messages. This is the message my browser game me:
hope you can see it
its some sort of active x control signed by microsoft, so no worries at all!
P.S. A piece of advice from my side:
get rid of all the antivirus crap on your PC and just get your windows updated regularly, you'll be fine!