Can't Purchase the Milviz C310. Help!

Hi all. As I'm sure many of you know, on Flight1.com, one of the products is the Milviz C310. It looks outstanding and I'd love to purchase it, but once I save the file and click Run as Administrator(Because Open won't do anything), Norton Security tells me that it has a Trojan. I've seen many other people with this plane, and they don't have any problems. I have Win 7(64 Bit), Flight Simulator X Gold Edition/Deluxe, and an outstanding computer IMO. Can someone help me? I'd really like to be able to purchase this product, as it makes me drool 
-Jake

-Jake