How to Turn on BitLocker in Windows

Method 1 of 3:

Go to Settings > Update & Security > Device encryption.
Choose "Turn on". This will enable BitLocker. It may take a while for the drive to fully encrypt.

Method 2 of 3:

Method 3 of 3:

Log on with administrative privileges.
Press the Windows button on your keyboard and "S" at the same time.
Type and select GPEDIT.MSC
On the left pane, select Computer Configuration > Administrative Templates > Windows Components > Bit Locker Drive Encryption > Operating System Devices.
On the right, double-click 'Require additional authentication' at startup.
Click the "Enabled" radio button. Double check that "Allow Bit Locker without a compatible TPM checkbox" is checked.
Click OK and repeat the process for enabling BitLocker in Windows.