GoPro Guru?

Hey, I've been playing around with the GoPro Hero4 Silver video camera — one of these. It's a great little camera but I'd like to minimize the "fisheye" look it gives to people when you shoot them close up…like in the same zip code.

I find conflicting advice on the Internet. Does anyone reading this know the camera well enough to advise me? I know there are programs for the MAC that can correct the imagery but I'm a Windows kinda guy.