Horizon is a virus?

to me when i try to run it my virus protector shows that there is a virus named sonar.exe.
i mainly am trying to download this for the forza 3 game save editor because i tryed to play it recently and all my cars and cr got deleted for some stupid reason and is pissing me off. some one help?

I Can Assure You No Virus,Norton Is Just… How Do I Say This, Stupid.

It’s not a virus as long as you downloaded from here: XboxMB - Xbox Message Boards - XboxMB

If you did, it’s a false-positive.