via lifehacker.com
...if you're really serious about protecting your data, you can actually hide your entire operating system. Here's how to do it.To accomplish this task, we'll be using TrueCrypt, our favorite free and open-source disk encryption software that runs on all platforms, supports hidden volumes, and can even encrypt your entire hard drive.
Once we've completed the setup, you'll have two Windows installations and two passwords. One password will activate a hidden Windows installation as your real operating system, and the other, a decoy install to throw intruders off the trail. (more)
