So you're not talking about a website, but an application letting you download things from torrent sites?
I would no more install that kind of thing than willingly install a virus, nor would I go anywhere near the utorrent site since a lot of downloadable stuff is illegally obtained and/or contains unwanted "add-ons".
Check your Settings in your accounts in System Preferences to see if it is listed there and if it is, delete or deactivate it. I don't believe Skype or a chat service would have anything to do with it, but since I don't have it installed, I am guessing here. My suggestion would be to uninstall it and get my downloads from reputable sources (and pay for them).