Select Control Panel from your start menu (if it’s not appearing on your start menu, click one of the letters in the left hand side of your start menu and this will collapse to show you all the letters that have applications against them).
Select “Windows System” and then select “Control Panel”. Make sure in the top right corner of the Control Panel you have the “View By” option set to “Large Icons”.
Once in Large Icon view then click BitLocker Drive Encryption.
Under BitLocker Drive Encryption, in the section next to your C: drive, click Turn on BitLocker.
Choose how you want to unlock your drive during startup: Select Enter a password.
Enter a password that you'll use every time you boot Windows 10 to unlock the drive, and click Next to continue. (Make sure to create a long password that is easy to remember, but write it down and keep it safe as if you lose the password you will have to use the recovery key mentioned below to get it back).
You will be given the choices to save a recovery key to regain access to your files in case you forget your password. Options include:
Save to your Microsoft account
Save to a USB flash drive
Save to a file
Print the recovery key
Select the “Save to a File” option and save the recovery key in a safe place. I would recommend storing on your server folder first and then once that’s done also copy that to a USB stick that you carry with you so that if anything happens when you are away from the office you have a way of recovering without needing to access the server in the office).
Click Next to continue.
Select the encryption option that best suits your scenario:
Choose between the two encryption options:
New encryption mode (best for fixed drives on this device) or Compatible mode (best for drives that can be moved from this device)
Click Next to continue.
Make sure to check the Run BitLocker system check option, and click Continue.
Finally, restart your computer to begin the encryption process.
On rebooting, BitLocker will prompt you to enter your encryption password to unlock the drive. Type the password and press Enter.
After rebooting, you'll notice that your computer will quickly boot to the Windows 10 desktop. However, if you go to Control Panel > System and Security > BitLocker Drive Encryption, you'll see that BitLocker is still encrypting your drive. Depending on the option you selected and the size of the drive, this process can take a long time, but you'll still be able to work on your computer.
Once the encryption process completes, the drive level should read BitLocker on.
You can verify that BitLocker is turned on by the lock icon on the drive when you open This PC on File Explorer.
That completes this "How To" procedure.