I decided to tab this because not one single tab on here has the main riff 100% correct.
i have proof that mine is right, here is the link to dan donegan from disturbed
the riff: http://www.youtube.com/watch?v=gz7sTYZJJMU   I take no credit for the main 
i just want to help people learn it the right way.  Great song/band, enjoy!  
Tabber: Yanksandjetsfan


Tuning Drop Db (C#)
Main Riff
Eb-------------------------------------------------------------|
Bb-------------------------------------------------------------|
Gb-------------------------------------------------------------|
Db-------------------------------------------------------------|
Ab------------3-5-----------5-6------------3-5-6-5---8-7-------|
Db-0-0--0-5-6------0--0-5-6-----0-0--0-5-6---------6-----8-3-5-|

Eb-------------------------------------------------------------|
Bb-------------------------------------------------------------|
Gb-------------------------------------------------------------|
Db-------------------------------------------------------------|
Ab------------3-5-----------5-6------------3-5-6-5-------------|
Db-0-0--0-5-6------0--0-5-6-----0-0--0-5-6---------6-3-5-0-3-5-|
            (Repeat)
Verse
Eb-------------------------------------------------------|
Bb-------------------------------------------------------|
Gb-------------------------------------------------------|
Db---------------------------------------------3--3--3-5-|
Ab---------------------------------------------3--3--3-5-|
Db-0-0--0-0-0-0-0--0--0-0-0-0-0-0-0--0-0-0-0-0-3--3--3-5-|
             (Palm mute open notes)
Eb-------------------------------------------------------|
Bb-------------------------------------------------------|
Gb-------------------------------------------------------|
Db---------------------------------------------3--3--5-3-|
Ab---------------------------------------------3--3--5-3-|
Db-0-0--0-0-0-0-0--0--0-0-0-0-0-0-0--0-0-0-0-0-3--3--5-3-|

Eb-------------------------------------------------------|
Bb-------------------------------------------------------|
Gb-------------------------------------------------------|
Db---------------------------------------------3--3--3-5-|
Ab---------------------------------------------3--3--3-5-|
Db-0-0--0-0-0-0-0--0--0-0-0-0-0-0-0--0-0-0-0-0-3--3--3-5-|

Eb------------------------------------------------------|
Bb------------------------------------------------------|
Gb------------------------------------------------------|
Db---------------------------------------------8--7--3--|
Ab---------------------------------------------8--7--3--|
Db-0-0--0-0-0-0-0--0--0-0-0-0-0-0-0--0-0-0-0-0-8--7--3--|

Chorus
Eb-----------------------------------------------------------------|
Bb-----------------------------------------------------------------|
Gb-10-------10-------12--------12-------------10-------10-------12-|
Db-8--------0--------10--------10--------3----8--------0--------10-|
Ab-8--------0--------10--------10--------3----8--------0--------10-|
Db-8--------0--------10--------10--------3----8--------0--------10-|

Repeat Main Riff

Post Chorus
Eb---------------------------|
Bb---------------------------|
Gb---------------------------|
Db---------------------------|
Ab---------------------------|
Db-0-0--0-0-0-0-0-0--0-0-0-0-|

Repeat Verse

2nd Chorus
Eb-----------------------------------------------------------------|
Bb-----------------------------------------------------------------|
Gb-10-------10-------12--------12-------------10-------10-------12-|
Db-8--------0--------10--------10--------3----8--------0--------10-|
Ab-8--------0--------10--------10--------3----8--------0--------10-|
Db-8--------0--------10--------10--------3----8--------0--------10-|

Eb----------------------------------------------------------------|
Bb----------------------------------------------------------------|
Gb-10-------10-------12--------12-------------10-------9--------7-|
Db-8--------0--------10--------10--------3----8--------7--------5-|
Ab-8--------0--------10--------10--------3----8--------7--------5-|
Db-8--------0--------10--------10--------3----8--------7--------5-|

Breakdown
Eb------------------------------------------------|
Bb------------------------------------------------|
Gb------------------------------------------------|
Db-0--1--0--3--0--6--0--1--0-6--0-3-------5-0-3-5-|
Ab-0--1--0--3--0--6--0--1--0-6--0-3-------5-0-3-5-|
Db-0--1--0--3--0--6--0--1--0-6--0-3-0-0-0-5-0-3-5-|

Eb------------------------------------------------|
Bb------------------------------------------------|
Gb------------------------------------------------|
Db-0--1--0--3--0--6--0--1--0-6--0-3-------3-------|
Ab-0--1--0--3--0--6--0--1--0-6--0-3-------3-------|
Db-0--1--0--3--0--6--0--1--0-6--0-3-0-0-0-3-0-0-0-|
          (Repeat 2X)

Repeat 2nd Chorus
Repeat Main Riff

End on
Eb------------------------------------|
Bb------------------------------------|
Gb------------------------------------|
Db----------------------------------0-|
Ab-6-5--------------6-5-------------0-|
Db-----6-3-5-0-3-5------6-3-5-0-3-5-0-|