Limewire Downloading Problem Slow

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My ISP is Xplornet 512kbps download speed and 128kbps upload speed. My modem for the Xplornet Internet is a satellite modem called SurfBeam. That modem plugs into my router D-Link DI-604. Now when i start up limewire it connects and when it's done connecting it's either in the green end or blue the connect and the globe has no brick on it. When i download a file it takes awhile to connect to person and finaly when it connects to the person it downloads at 1kbps or 0kbps. I'm also getting this file from someone on a Cable/DSL or T1 internet connection. So i should be atleast downloading at 50kbps or 64kbps. I don't know what the problem. I know my ISP doesn't block limewire. So someone please help me!!!!!!!!! Thanks

Many thanks for replying Grandpa. Sorry for the delay but as I am in the Far East it was the middle of the night when your reply arrived.
My modem/router is a DareGlobal db 108 using 100mb connection speed. I have not been satisfied with the speed of downloads, as others have said very often 1 or 2 kbs when Im sure it should be better.
If you can assist I would be grateful.
Thanks

does the ultrapeer capability have any influence on how fast i download files from LW?