The best way to set this up is to create a 1.5GB partition along with a 50GB partition when you first install Vista. If you're kicking yourself now because you've already installed Vista, don't worry -- A simple utility called the BitLocker Drive Preparation Tool can automatically redo the partitions for you. If you've already made the 1.5GB partition, you'll still need the preparation tool to transfer the necessary files from your Windows partition to the 1.5GB partition.
To get the BitLocker Drive Preparation Tool, you can go to Windows Update and look under Vista Ultimate Extras. There, you simply check BitLocker Drive Preparation Tool to download and install.
To launch the tool, hit the Start button and type bitl. You'll see it pop up as the first program, as shown here.
Credit: TechRepublic
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