I guess you read this sticky right through.
http://www.gnutellaforums.com/showth...threadid=51357
The second post gives a list of details we ask for, so if you could list those it would maybe help us to try to solve your problem.
I suspect details of your modem, router if you have one, and Internet Service Provider might be the most important, but please try to give us as much info. as you can.
Do you have problems surfing or downloading with your browser?