Your Router is fine as it doesn't have a Nat Firewall, so going with UPnP is the best way ....
Your details seem to be good as well, I can't see any problems that stand out...
So I suppose it could be a case of Fake Files, have a look at this thread it explains what they are and how to avoid them...
http://www.gnutellaforums.com/downlo...h-results.html
Could you also try downloading a file from here please...
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