We don't work for LW but we still might be able to help you out if you give us your
System details - help us to help you (click on 'this' blue link)
If you're having problems since installing LW 5 & would rather go back to using LW 4 there's a page to download old installers:
Lime Wire » Download Out-Of-Date Installers
If you're using Pro, your personal download page has a link to 4.18.8 on the left hand side - 'Get LimeWire Pro Classic'.