For Windows systems, you should download the OpenVPN GUI stable release 2.0.9 from http://openvpn.se/download.html, or the release candidate 2.1 from http://openvpn.se/development.html. Starting with version 2.1, OpenVPN includes the Windows GUI in the installer. 2.1 is still in RC but is quite stable and has some advantages over 2.09. One of the main one is that your can run it on 2000/XP without administrative privileges.
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For Windows systems, you should download the OpenVPN GUI stable release 2.4.4 from https://openvpn.net/index.php/download/community-downloads.html. OpenVPN includes the Windows GUI in the installer.
On Windows, the configuration directory for OpenVPN is C:\Program Files\OpenVPN\config
On Windows, the configuration directory for OpenVPN is C:\Program Files\OpenVPN\config