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BitLocker is a Windows inbuilt feature that helps you encrypt the whole hard drive. It offers great protection to your files and documents . You can enable it from the control panel under Syatems and Security. You will see the icon for turning on BitLocker.
It works well such that you will not notice any difference in your computer operations. In addition you do not require a decryption password as other third party software does, instead it uses your Windows password and decrypts once you log in.
Download BitLocker here http://en.softonic.com/s/bit-locker