Convert the song into mp3 format.
Play it in WinMediaPlayer > POD > headphones with your bass plugged in to "practice with it" as well. One of my woodsheds:
On parts you have trouble with, slow them down with the player and repeat until you get them...gradually bringing the speed up.
Also, if you REALLY want to learn it:
Make a CD with that as the only song.
Do NOT listen to anything else but that when you listen to music PERIOD!