As you will soon realize the most difficult part to this song is the timing, so pay close attention to the midi examples. To help you with your timing use the correct picking direction, D=Down & U=Up (D DU UD DU UD D).
This part of the song is normally done with the bass guitar, it plays over the top of the previous riff. If you have a friend who also plays the guitar you can play both parts together, or just use the midi example above while you play the riff below.
It doesn't matter what picking direction you use for this part, it's pretty basic.
Some common mistakes I've seen when teaching this part of the song is students leaving their fingers down and treating this riff like a chord. Make sure you only have one finger down at a time, play the 15th fret on the 1st string then the 17th on the 2nd string, don't leave the 15th down, lift it off. Do the same when you play the 16th fret on the 3rd string, make sure you lift off the 17th. This will produce a nice clear note sound with no overlapping overtones.
Drop D Riff 1
To play this correctly you have to drop the thick E string down to a low D note. You can learn how to do this in the "Drop D Tuning 5th chords" section. Drop D tuning is a very popular style in today's music, so make sure you understand how to do this.
Drop D Riff 2
Once again this is drop D tuning, listen to the midi examples to get your timing. Notice the 16th note rests between the notes, the first two notes are cut short by the rests in the middle of them, you do this by lifting your fingers off the frets but not off the strings. Take note of the 5/4 timing as well, it sounds like it's going out of time, but it all comes together in the end.
Please remember this song is not exactly the same as the Limp Bizkit version or even the original for that matter, it is my interpretation of the song best presented to the intermediate or good beginner guitarist. So please no comments on how the song isn't like the original.