If you want to resolve the issue, we will need more information:

http://www.gnutellaforums.com/connection-problems/62652-system-details-help-us-help-you-provide-these-details-when-you-post.html

If you're sharing anything remotely popular, you should see some upload attempts. If you want to, try downloading something that you know that a lot of people would want. See how it goes.