geez, thats why people just stop coming to this place, even my comment will suck this thing even more. why dont you stop that "OMG YOU RIIPPER , YOU DUN H4V P3RMAAAN!!!!SSION!!" ....(permission)
Geez, he is simply asking for help for his own thing, he isnt releasing this model or anything else yet. Instead of helping or asking him what steps he did you start picking on him and tell him how he sucks.
meh, whatever.
Anyway Morving. I cant tell you what your problem may is, but looks more like alot of Vertexes havnt been assigned to the head bone (in main: the head bone isnt assigned with any vertice)
if it is, then rerigg the whole model, should fix your problem.