Check tips 5 & 6 here: Fixes for Limewire (click on blue link) & if necessary, check tip #3.

If none of that works, use this technique: http://www.gnutellaforums.com/333278-post2.html

That's as much as I can help you with the amount of information you have given me. I presume you are using windows of some kind & not linux or mac or dos or LDC or CDC or UYA.