If your PC doesn’t have a TPM chip, you can still use BitLocker. In this case, however, you’ll be forced to jump an extra hurdle when you start your computer. This hurdle will either be an extra password that you must enter or a USB flash drive that you must insert. Only by doing this will Windows 8 decrypt the drive and enable you to work with your computer in the normal way.
First you need to configure Windows 8 to allow BitLocker on a system without a TPM. Here’s how it’s done:
1. At the Start screen, type
gpedit.msc and then press Enter to open the Local Group Policy Editor.
2. Open the Computer Configuration, Administrative Templates, Windows Components, BitLocker Drive Encryption, Operating System ...