when you receive this error message, “gpg is not recognized as an internal or external command” then you need to update your PATH variable.
To do this without reboot:
1. Open up a command prompt window
2. Paste this in:
SET PATH=%PATH%;C:\Program Files (x86)\GNU\GnuPG
3. Hit Enter
Thank you http://www.nerdydork.com/update-windows-path-without-rebooting.html