If you ever are on some windows machine or any OS for that matter and you can't remember exactly where it says the version of the OS then I have the site for you. It's called whatsmyos.com. Dead simple site. It uses your browser agent to tell you the OS your using and in the sections below it tells you how to find the version of lot's of different OS's. It even helps you find out if your using a 32-bit or 64-bit OS. Fast and to the point. I like it.