1) Open WinRAR
2) Go in the directory where your files are inside WinRAR
3) Select all the files
4) Commands>Add Files To Archive
5) Archive Format: Zip - Compression method: whatever you like
note: you micht want to check "Test archived files" (this will make it take longer, but ensures good zips were made) and "Delete files after archiving" if you don't want the original files any longer.
6) Click the files tab
7) check "Put each file into seperate archive"
Kinda on the same note, but does anyone know how to merge folders? Like if I have a large amount of folders each full of mp3s, how could I merge the folder so that the merged folder holds all the mp3s?