To rig this make a new copy of this file and delete your armature. Once your armature is deleted set your 3d cursor to the center by pressing Shift-S and choosing “Cursor To Center”. Now do the same to your model, once the model is in the middle move it up (Z axis) so the feet are just above the grid floor. Press t to bring up the tools panel in the 3d viewport and with your model selected in the tools tab select “Set Origin”, Set “Origin To 3d Cursor”. Now your model should be centered and without any armature.
With the model selected press Ctrl-A apply location, rotation and Scale (very important). With the 3d cursor at the center press “Shift-A” and scroll to “Armature” and select “Human (Meta Rig)” (important for proper naming convention). Scale the Meta Rig to fit your model rotate the legs and hands, arms and legs to the correct position. With the Meta Rig selected press Ctrl and A apply location, rotation and Scale (very important).
Select your model and the shift select the Meta Rig press Ctrl-P choose “With Automatic Weights”; this may take several minutes. Your Model should be rigged at this point. You will need to weight paint it. Once weight painted you can export the Meta Rig and animate it in another blender file if it is to slow with the model and export the animation as .BVH format. You can download the MakeWalk plugin from http://www.makehuman.org/blog/makewalk_updated_mocap_tool.html which will allow you to use .bvh motion capture animations instantly.
Once you have the plugin press T to bring up the tools tab and then scroll down in the tools until you find MakeWalk Utilities and click on set T-pose(most likely errors are caused by not applying rotation, location and scale Ctrl-A). This will set the Meta Rig to a T-pose which MakeWalk will then use as a base to animate. In the tools tab scroll until you find MakeWalk Main, click on “Load And Retarget” this will load any .BVH humanoid animation file (Some .bvh files downloaded from the net will need to be fixed).
Rigged in 2.70a animated with MakeWalk v0.943