If you’re prompted by Windows to select a program to open this file with (see screenshot below) – click the Browse… button. If 7-Zip opens up, skip down to Step #11 below.
Locate the Android-v4.7z file that you downloaded back in step #1.
This step-by-step guide will show you how to install and run Android 4 (Ice Cream Sandwich) on your Windows PC using nothing but free software.