Only getting half of my d/l speeds!

ok so... my cable download speed according to speedtest.net, speakeasy.net is 26000 kbps which i think is roughly 3.0 mbps transfer rate. but i'm only downloading at 1.15mbps. i know its not the website i'm downloading from because my friend downloaded the same file at 3.2mbps and he lives right next to me. i just cant figure out why i'm losing speed... i'm trying to d/l with firefox on vista 64. i do use a router for my network(pc, 360, ps3)... not sure what to do! so hopefully someone can help me out? thx XD

 

bump.... anyone have any idea's?