Shareaza sucks, it lowers every Gnutella user' speed: avoid at all costs. Use Bearshare lite instead
http://www.bearshare.com/lite/
You could alternativly download the latest LW beta:
http://www.limewire.com/english/content/beta.shtml
Ciao
PS: Shareaza is bad philosophy P2P! It is acceptable only if you use G2 without the other networks.