I don't use utorrent, but im sure it has an option to set a upload cap. Try that out, play with it till it doesnt affect your network.
With all due respect John, I am the head of IT and I have it on good authority. If you type "Google" into Google, you can break the Internet. So please, no one try it, even for a joke.........It's not a laughing matter. You can break the Internet.