ok a few questions first.

what directory do you have shared out? what does it say under tools>preferences>shares?

do you have a firewall or anything up?

how long did you let it look for? the full 3 weeks?

did you use the full file name? or just parts of it? and when you put the filenames in your search do you get others with the same file name or close to it come up?

the more info we get, the better we can help out.

But basicly, when you share out the folder on your system it might take a bit of time befor someone actually downloads from your system. the clients have to look through the host lists to find your system to link to.