It is unlikely that your ISP is blocking a wide range of ports. That tactic was abandoned some time ago when bittorrent clients offered the option to choose your own port.
Are you using a port for uTorrent within the 49160-65534 range?
Have you set an exception for uTorrent, or its port, in your software firewall?
Have you looked at the guide here:
Optimizing µTorrent (or BitTorrent) For Speed