After thinking about your post, I've found there isn't a compiled set of files to do what you want, unless you want to pay for the program, but there may be an option depending on what version of email program your using. See: GnuPG plugin for Outlook 2010 on Win7
I was going to suggest Gpg4win - Download Gpg4win
, but wasn't sure what versions you were going to use it for, again it will only go to Outlook 2007.
Compiling a set of files to produce a working program can be difficult at best.
This link may help: How To Easily Encrypt Email or Text Documents [Windows]
It does have an easier to digest link to Gpg4win: Gpg4win - Secure email and file encryption with GnuPG for Windows
What are you trying to encrypt? There might be other alternatives.
In the meantime I'll ask for assistance on another thread we have, and hopefully we'll get a reply.