You're obviously a Windows user! In Windows, iTunes does not import the songs from LW. What it does is create a Limewire playlist. This is purely a reference to the files you have dwnlded & are in your LW Dwnld folder.

So if you only deleted the LW program, your files should be still in your LW dwnld folder wherever that is. The default location I think is usually C:\Documents and Settings\"your account name"\Shared

Else, use your search engine to search for .mp3 & see what folders show up.

If you deleted your LW dwnld folder, have a look in your Recycle Bin. If that's been emptied then you'd need to use a file recovery utility to get them back or else re-dwnld them with LW.