Seeking a simple, free asymmetrical encryption app.

I am in search of a simple PD encryption app, with the following features:
1. Can generate a private/public key pair.
2. Can encrypt and decrypt, using these keys.
3. It needs to be VERY simple, preferable with minimal bells and whistles.
4. Free, or cheap.
5. Runs on at least Windows 7 and above, 32 and 64 bit.

This is to be used to securely transfer files via email, dropbox, or USB keys. This has been prompted by some companies we deal with who insist on a high level of security, but are not all technically literate, hence it needs to be something that I can write up usage instructions for that an average computer user can interpret and action.

Any ideas?
LVL 21
Mal OsborneAlpha GeekAsked:
Who is Participating?
Have you considered GNU Privacy Guard? GNU version of PGP, the original public key encryption standard. Available for virtually any operating system.
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