How to disable
Trusted Platform Module (TPM) in BitLocker:
BitLocker on Windows 7/Vista does not support passwords for system
drive if TPM is unavailable. If you do not like to use USB Startup key or memorizing BitLocker Recovery Key (which can be
used like a password), upgrade to Windows 8 or later which
supports passwords for system drive even if TPM is unavailable.
- Open Group Policy Editor:
If Group Policy Editor appears
to be unavailable, follow instructions
for enabling BitLocker first.
- Open Local Computer Policy > Computer
Configuration > Administrative Templates > Windows Components
> BitLocker Drive Encryption > Operating System Drives.
- Edit Require additional
authentication at startup policy.
- Set the policy to Enabled
and make sure Allow BitLocker without
a compatible TPM is checked.