Transmission kills my connection (torrent)

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http://askubuntu.com – I have a simple one today, I've been using transmission for a couple months now and since the beginning I noticed that if I open transmission, NOTHING else works.. well, I'm talking about internet, not even typing google.com at browser. I tried setting up the upload limit to 5kbps and download to 20kbps.. even so the connection doesn't work. One particular fact is that it happens just on my pc, because I can use internet with my laptop without any problem connected to the same router! Anybody else with the same problem? does anybody knows about a fix? (HowTos)