I am reluctant to offer any advice on using Limewire, Morpheous, or Kazaa, as all of these programs download spyware and other internet parasites to your computer which will eventually cause numerouos errors in internet explorer and slow your system to a crawl, in which case you will be back on the forums crying for help in ridding yourself of these dangerous and obnoxious programs.  My advice at this point is to uninstall any Limewire, Morpheous, and Kazaa.  Then do a complete spyware scan of your computer using the free versions of Spybot and Adaware to rid yourself of the garbage that came with these programs, and then find a file sharing system that does not load spyware and malware onto your computer.  Trust me you will be thankful that you followed this advice.

Steve 

Here is a list of infected and clean peer to peer file sharing programs:

http://www.spywareinfo.com/articles/p2p/

Note that I am going to have to retract what I said about Limewire.  It appears that they have cleaned up their act and the current version no longer bundles spyware.  Still, be aware, because viruses are easily passed through these file sharing programs.

As for the firewire issue, see the following from Limewire's support site:

http://www.limewire.com/english/content/firewalls.shtml

Steve