How to Enable Bit locker in Windows 7 without Trusted platform Module ( TPM )

          First lets see what is Trusted Platform Module (TPM).

                 Trusted Platform Module (TPM) it stores a key from the key pair that is used to encrypt/decrypt the hard disk drive if the Bit Locker drive encryption feature is enabled.

1.  Log on to Windows 7 computer with the administrator account.
2.  Click Start and in the search box at the bottom of the menu type gpedit.msc and press Enter key.
3.  On Local Group Policy Editor snap-in from the left pane under Computer Configuration go to Administrative Templates > Windows Components > Bit Locker Drive Encryption and from the expanded list click to select Operating System Drives.
4.  From the right pane double-click Require additional authentication at start-up .
5.  On the opened box click to select Enabled radio button and under Options section check Allow Bit Locker without a compatible TPM
6. checkbox if it is not already checked.
7. Finally, click OK button when done and restart the computer to allow the changes to take effect.