Trojan Gen 2 detection

I run Norton 360 premier edition.

Over he last week, every software download I run detects Trojan.Gen.2 presence in the download, and promptly removes the file(exe).   I find it hard to accept that this trojan is in every diff download I try.

Is it something on my machine causing it???.....or something has gone astray with my Norton's version.    I don't really want to turn off all protection to test this out.    Any suggestions.

Noel