Chances are your set up is fine. Is there a brick wall in front of the earth meaning it might be a firewall problem?

Are you getting hits for your files? Check your library page. Hits show the number of times your files show up in someone elses search results.

Judging from your other thread you have a lot of files in queue. If all your bandwidth is used up with downloads you might not have enough left for someone to upload from you.

It could be that no one is looking for your files or there are enough out there that none are being uploaded from your pc.

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If it ain't broke, fix it till it is!