Paden brought this to my attention - thanks Paden.
There's no way that you could be getting a virus from MTS just by connecting and downloading a RAR or ZIP file. If there were an issue with MTS like that (which there isn't), then it wouldn't be just you having the problem but -thousands and thousands- of users with the same issue (we've got over 3000 people online right now) and whenever even a slight hiccup happens in our downloads, we get dozens of posts in Site Issues. Either you have an overactive antivirus acting up and alerting or the infection is triggering when you download but is actually coming from somewhere else.
In any case, downloading from MTS is perfectly safe and will not harm your computer in any way. Perhaps get yourself a different antivirus to clear your infection once and for all.
- HP
(MTS admin)