>:) But I mean Windows Explorer
Yes, I confused that.
In this case, if you can't find how to change the option, I agree with the other reply you got: the Explorer is an integral part of the OS, and I don't think you can install it separately.
You might, however, also use some substitute program for Windows Explorer. Personally, I don't do this - I got very used to it.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)