How to get Lime Wire media player to work
 

I have been using Lime Wire for about a year. Last week I had to reload my operating system (Windows 98 SE) since then I have reinstalled Lime Wire but cannot get the media player to play any music that I have downloaded. I did not have this problem before. Any sugestions as to what the problem would be. I have reinstalled Lime Wire to see if that would make a difference.
Dave