Axcrypt is a very simple elegant way to encrypt single files in Windows. Here's what the website says:
"Right-click integration with Windows Explorer makes AxCrypt the easiest way to encrypt individual files in Windows.
Double-click integration makes it as easy to open, edit and save encrypted files as it is to work with unencrypted files.
Many additional features, but no configuration required, just install it and use it.
AxCrypt encrypts files that are safely and easily sent to other users via e-mail or any other means. Self-decrypting files are also supported, removing the need to install AxCrypt to decrypt."
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