I guess that the problem is that the faces that should be visible are transparent and that you can see the other faces, the back ones... I had once that problem and I think it's due to a bad .x export with milkshape. Visit the 3D forum and look the thirth sticky, there is a visual explanation about how to export properly with Milk (only works with a bone in the object).
The other problem can be tat you see through the model cause it is at the middle of the cam and the faces desapear, try tomove it until it doesn't happen.
This could have been an intelligent sentence.