My limewire was working perfectly fine one day and then the next day it wont let me download anything. A message pops ups saying "Limewire is unable to find a license for this file. Download anyway? Please note Limewire cannot monitor the or control the content of the gnutella network.Please respect your local copyright laws." That was the message that pops up everytime i try to download something. I dont know if this has anything to do with it but it also says limewire has detected a firewall and i dont know how to remove the firewall. so can somebody help me out.

Well if you select a file to downld that a licence can't be found & you press no then you probably won't be able to downld it. If you ticked the option to always use that answer then that's what will happen everytime. Go to Tools>Options>View>Popups & tick revert to default & press apply & that will bring back all those options again.

For configuring your firewall (advisable not to have 2 active firewalls b/c they can interfere with each other); Firewall configuration instructions (click on link)

If all that fails then try deleting your LW Preferences folder whilst LW is closed; instructions here: Fixes for Limewire