Standard tuned.
Riff 1:
e---------------------------
B---------------------------
G-----5-2-----4-4-4-4-5-4-2-
D-7-7-5-2-4/5---------------
A-7-7-3-0-4/5---------------
E-5-5-----2/3---------------

Intro:
Riff 1 x2 A#5 A5 G-4-4-4-4-5-4-2

Verse 1:
Riff 1 x2 A#5 A5 G-4-4-4-4-5-4-2

Pre-Chorus:
There's really no guitar, but I play along with the vocals for the descending line.

e-12-10-9-7-5-3-2-0 
And after the descending line, I play A-5776xx
x2

Then on everyone's been scared to death, I play:
A#5 A5 E5

Chorus(D5 is played for a while, others are short):
D5 F#5/G5 D5 F#5 G5 

Feeling Alone-
B5 A5 G5 E5
Where is-
A5 G5 G-4-4-4-4-5-4-2

Then like The intro again.

The second verse is just downstrumming all of the strings muted with your fretting hand.

Pre-chorus again

Chorus again

Intro again

Bridge: F#-x-x-12-11-x-x D-x-14-12-x-x-x

F# D F# D F# D D5 x2  
F# D F# D F# D E5(12th fret)
C5 B5 F#5 G5 A5 B5 C#5 D5

Chorus again, then like the intro to finish, ending on D5.