What I normally do is use the uninstaller that comes with Media Jukebox, this will take out the operating side of it, but leaves your library files etc.
So 1st click your START button, bottom left of your Windows screen, then ALL PROGRAMS, then find your MEDIA JUKEBOX entry on the list & click it & at the bottom of the mini menu that opens you should see UNINSTALL MEDIA JUKEBOX.
Click that & on the new screen you should see two boxes & one should already have a tick in it = REMOVE ALL MEDIA JUKEBOX REGISTERY ENTRIES & that's what you want, as you want to leave your library in tact. So now just click remove=no more MJ.
Once this is done you can now download the lastest version of MJ at:
http://www.musicex.com/mediajukebox/index.htmlOnce this is downloaded & you're in your new version of MJ, go to SETTINGS (top left of your screen), then OPTIONS, then scroll down to ENCODING, then in the box next to ENCODER you should see "Uncompressed Wave" with an up/down arrow to the right of it, click that & the mini menu opens. Click on any one you want, say MP3 & if it's not already loaded just follow the prompts to download the associated software (which downloads very quickly).
It's easy ... All the best - Rusty