Can I check what firewalls are on my computer?

This may be a routing problem, most leechers (peer to peer) programs have to map specific ports out of your system. If you are on a wifi connection or a non routable network (behind another computer or router) you will not be able to use these programs at full speed without configuration.
If you are running a wifi router, or normal router. Take a look at its menu configuration you are looking at doing port mapping, somtimes refered to as port redirection or natting. This will speed up your downloads (SIGNIFICANTLY)
By the way dump limewire, go to www.utorrent.com (Much better)

dave
January 2007