Everyone except Ral Partha is pretty much wrong.
@ DeadandBroken,
Those will not rip the files from the games, 3ds Max is for editing them, but I don't really know what 3D ripper is.
@ Primal Weyland,
True, we don't generally discuss this here, but if it were illegal, then Halomods would not be a website. Halomods provide the programs, and show you how to do it. They just don't provide the models.
@ AoBFrost,
The models are the models. You don't need to take any lighting off or anything. If we did, then it would be a lot easier to make good renders of the model.
@Ral Partha,
You summed it up best. We can't tell you how to do it, and generally don't talk about it.
Besides, you need to know what game you're trying to extract from, and go to a website that is specific to that game. For Halo, go to Halmods, ect.