Download the latest OpenVPN Stable Windows Installer HERE and install it as well the TAP-9 adapter that comes with it.
Download the configuration files of the servers you want to use HERE and copy them to the folder C: \ Program Files \ OpenVPN \ config
Launch OpenVPN from your desktop in administrator mode
Right-click on the icon in the taskbar, choose a server and enter your username and password to connect.
You can view your credentials for the VPN in the client area> services. Note that credentials are case-sensitive.