I had my guitar teacher help me with this one and I play it with my band all the time so I know its right
Make sure that your guitar is tuned to drop ?D? if not this will not work

            v         v (4-4 strok up)
e------------------------
b------------------------
g----5-5-5---------------
d----5-5-5---------------
a----3-3-5--4--3-3-3--4--
D-----------4?-3-3-3--4--
Do this 4 times 
e-----------------------------------------
b-----------------------------------------
g------5-5-5-5----------------------------
d------5-5-5-5----------------------------
a------3-3-3-3?--5-5-5-5?7-7-7-7?3-3-3-3--
D----------------5-5-5-5?7-7-7-7?3-3-3-3-- 
PM?????????????????......................
do this^ one time
e----------------------------------------
b----------------------------------------
g------5-5-5-5---------------------------
d------5-5-5-5---------------------------     
a------3-3-3-3?--5-5-5-5?7-7-7-7?3-3-3-3-
D----------------5-5-5-5?7-7-7-7?3-3-3-3?
Do this one two times not pm

e-----------------------------------------
b-----------------------------------------
g------5-5-5-5----------------------------
d------5-5-5-5----------------------------
a------3-3-3-3?--5-5-5-5?7-7-7-7?3-3-3-3--
D----------------5-5-5-5?7-7-7-7?3-3-3-3-- 
PM?????????????????......................
     
e----------------------
b----------------------
g----------------------
d----------------------
a------5-5-5-5-5-5-5-5-
D------5-5-5-5-5-5-5-5-

e--------------
b--------------
g----5---------
d----5---------    This is the bridge (do this twice and an the last time pm the 
a----3-5-3-5-3-    last cord)
D------5-3-5-3-
After this it starts all over again 
If this is a little confusing to you im sorry but I promise you if will sound better than all these other crapy tabs that are wrong