You can slow them down if you rip them to your computer and play them through windows media player.
If you right click on the edge of the media player it will come up with a menu, click view, then enhancements, then play speed settings. You can reduce the speed by about 50% with out altering the pitch. You do lose a little bit of quality but they are still very playable. It is also very useful for trying to copy stuff.
The cd must be ripped though, it will not slow down if you are just playing it through media player.
Hope that helps
what I use myself is winamp there is download patch called (pacemaker) which allows you set tempo, pitch, and speed, to any music ripped to your music folder ie "take the lead" to settings you are happy with I think it is a lot more flexible :welldone