Your save directory question
 

I was able to get on lime wire fine just yesterday, but all of a sudden this message comes up and the thing wont even load up.

"Your save directory is not valid. It may have been deleted, you may not have permission to write to it, or there may be another problem. Please choose a different directory"

How do i do that or what can i do so i can start downloading again?

Sounds like your prefs might have changed, Or you've made changes to your directories that's confused LW. Have a look at your LW Prefs, in Windows I think that's Options. From there, see where your incomplete & download folders are & that they're the same as before. If not, correct them using these LW Prefs. Otherwise, if LW was working fine before, you could try a System Restore back until it was ok.
If you're on mac OSX, it sounds as though you're attempting to save your files to a part of the System folders that you have no permission for. Make sure your incomplete folder & Dwnld folders are somewhere you have access to such as within your 'Users' area (or another HDD/partition). On Mac OSX see your LW Prefs & Saving option.

Thanks I got it to work again!