Katgirl-
You have to open LimeWire, tools, options, then sharing.
This is the file you must screw around with. In the box you should see
C:\Program Files\LimeWire\Shared
If its in the box, click on it then hit add. If it is not in the box, try hitting add, then put it in the box. My first method should do the trick. If it doesnt, make sure its in the box anyway, then go down to extensions and type in "C:\Program Files\LimeWire\Shared" without the (" "). Press Apply then OK. I had the same problem, but after reading through the forum i found the answer something similiar to this. Hope it works, good luck.
-JayDog