FOSS gamedev and creative worlds

Lately I've been trying to install minecraft on my computer and Everytime he download completes I get a Error message and my Computer Crashes, When I found out about this I instantly Feel In Love. Can You give me Step, by step Directions on how to install it, i would Highly Appreciate the Help,
xxGaurdingDragonsxx

Hi!
Download this file: https://github.com/downloads/celeron55/minetest/minetest-0.2.20110922_1.1-win32.zip and extract it in a folder. Then go into into this folder and launch minetest.exe which is located in the "bin" directory.