downloading block
 

I know I'm a bit technologically challenged, but I need help!! I downloaded about 12 songs on to my MP3 through Limewire Basic but as I was doing this at school and ran out of time, I closed everything down. When I tried to download my remaining songs from my playlist the next day it wouldn't work- a warning sign saying 'cannot find the file' keeps popping up. For every song. How can the file not be found when it's right there?! Any ideas? Thanks