I don't see how Limewire should disappear from deleting the preference folder. Are you sure that you didn't delete the program folder by mistake? It's called Limewire also.

Deleting the prefs should just reset Limewire.
They should be found in C:\Documents and Settings\**Your Username**\Application Data

Well no harm done there. You can just redownload and install it.

Also you have to be more specific which instructions you don't understand. Every answer will just be guessing if you don't