i was messing around in the settings.
i went to the skins setting and changed it to black.
it was cool.
so i made the font way small.
when i wanted to make it one more size smaller, limewire shut down.
whenever i try starting it back up it says there was a fatal error.
i tried shutting down my computer, uninstalling/reinstalling limewire, and even downloading it again!
nothing i try is working!
help?
please.

Try deleting LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will change all of your settings within options, you'll have to go back through afterwards & reset things. If you're not sure of your settings, go through LW's tools > options & write them all down, so that you can reset things later.
In case you're using Vista: LimeWire Pref Folder in Vista