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On platforms that do not have a TPM, BitLocker can be used to encrypt the OS drive by enabling the "Require addition authentication at startup" policy.
- gpedit (run as administrator)
- Browse to Local Computer Policy – Computer Configuration – Administrative Templates –
Windows Components – BitLocker Drive Encryption – Operating System Drives –
Require addition authentication at startup.
- Select “Enabled” and “Allow BitLocker without a compatible TPM”. (requires a startup key on a USB flash drive)
Same as for Windows 7 except that requires a password or a startup key on a USB