From http://www.top-windows-tutorials.com/Disk-encryption.html Truecrypt encryption tutorial 4 - How to use full disk encryption with Truecrypt 6 - The disk encryption software in Truecrypt 6 supports encryption of an entire Windows installation. This means that every file on your computer can be encrypted. Previous versions of Truecrypt could not encrypt operating system files and folders, or the temporary files and folders Windows creates automatically as you work with your computer, such as the virtual memory paging file. Using full disk encryption means that your data is safe and sound no matter where it is stored on your computer.