The mIRC downloads from this site are trojan & virus free. This is a problem with the way Norton, and some other anti-virus programs detect trojans. I suggest that you ensure that your virus definitions are up-to-date then reboot and reinstall mIRC. You shouldn't have any problems with up-to-date virus definitions, as that is what I had to do with my version of Norton before installing mIRC. Once my virus definitions were up-to-date, I had no problems.
If you find that you still have problems, by all means, post a reply letting us know.
P.S.: The auto-update is not sufficient. Run a manual update of you Norton files.
