Download no more than 1 KB/S

I upgraded to 2.5.5 Basic and now it won't download faster than 1 KB/S. Sometimes it's 0.1 or maybe a little more but nothing over 1 KB/S. My mac (OS X) is a dual processor and has 1.1 Gig of ram so it's not the comp. My connection is a type of Ethernet my school provides so it's super fast. It could possibly a firewall problem but only now has this been occuring. I'm not downloading from a modem either. Right now it says I'm downloading from 4 hosts at 0.3 Kb/s. I would like to get this song before it becomes an oldie. Thanks