Player model: Limbs stretching out of place

I have been working on a player model for the past two months now and I am just about done expect that the arm so the model are not in the position they should be in. I have editing the roll setting in blender but no matter what I set it too they stay at the same length. I deleted and added code from the qc file hoping it was a code glitch, still nothing. I am still new to modeling and no tutorials seem to exist on this issue. What should I do?