Bitlocker only works if you have Windows 7/10 pro version and a TPM module. I think winzip will even do a folder zipped to AES256 if you want a super simple free version. GPA/GNU is the super secure way via PGP key pairs. There are a ton of simple free programs to do it with, I use axcrypt but it's only free for a while, boxcryptor for dropbox and box.com. Or use sync.com in the cloud that is truly zero knowledge but won't protect it on your desktop. Just hit download.com and there are a ton of decent free ones.
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