First, go to the bottom left side of your screen and press on the search bar. For Windows 7 users; press the start button, then press on the search bar.
Type in the following: CMD
This screen should pop up on the screen
A long list of numbers should pop up. Look around the bottom-middle for something that says " IPv4 Address ". Follow the dots and the number(s) that show on that row is your private ip!