If it still helps you , know that 3ds max should render and mode everything smooth if your model if not bigger than 100.000 tris and you don't have spyware , malware or anything really bad going on with the computer ( overheating maybe ) .
My advice would be : format computer , check for overheating ,hardware compat. and reinstall . Also install latest drivers and set your 3ds max to direct 3d . Cheers .