To stop BitLocker from automatically unlocking, you can use the BitLocker Manager on your computer. From there, you need to click on the Turn on auto-unlock option and turn it off.

If BitLocker does not turn on, ensure your computer meets system requirements. Check the TPM (Trusted Platform Module) settings in the BIOS and verify that your disk partition is set correctly.

Right-click the drive and choose Manage BitLocker from the menu (or search for the BitLocker Drive Encryption utility from the Windows 8 UI as described earlier), and you’ll be able to change ...