when i launch a file to play it, it opens up a new window in musicmatch jukebox. so i deleted musicmatch but now it plays it in windows media player. i just want it to play in limewire like it used to. =/

The LW player is horrible but if you want to use it, in LW go tools > options > player. Tick 'use LW player' > apply > ok.

You might also have to change the file associations within WMP. Open WMP > tools > options > file types. Untick the file types that you don't want WMP to play > apply > ok.