I bet you're using Norton or McAfee, aren't you.
Yeah, but in some cases even the dumbass router software is saying the uploader's adress behind mediafire is dangerous. I've downloaded mods for SEVERAL other games before, and this is the only site where issues have really came up consistently. I've also been able to download several mods from brawl vault in the past without problems. Somehow I don't think these are false positives, if that is what you are suggesting. Do you know anyone else who has these issues if they are false positives?
Also many of the files that are flagged as "infected" appear to be fairly old (like at least 2 years old since being modified). Is it possible that something could have corrupted the files which were hosted on mediafire for a long time? Sorry I don't know too much about this and just want to know what exactly is going on, or if there is a way to fix this.