I've seen a lot of wrong tabs for this song. Indeed, it can be hard to figure out what 
is playing a lot of the time. I'll try to tab the whole song out when I have time.

|--------------------|
|----------4---4---4-|
|----------4---4---4-| Repeat and then Repeat some more.
|----------4---4---4-|
|4-2-1---2-------2---|
|------2-----2-------|

It's kind of a fast switch to that bottom string in the beggining.
Also, the last time through before the drums and bass come in, Kurt palm mutes the 
of the riff. Listen to the CD and comapre...I haven't.