BitLocker is a tool in Windows that can be used to encrypt fixed drives, but also operating systems as well to protect your core data from outside intrusion.

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Windows 10

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

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Windows 7 and Later

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    Press the Windows button on your keyboard and “S” at the same time.
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    Type in “bitlocker” in the search window that comes up.
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    Select “Manage BitLocker”.
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    Click on “Turn on BitLocker”.

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Enabling BitLocker without Compatible TPM

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