This is a short short note how to get OpenVPN-GUI 2.X working under Windows Vista.
First of all you have to set it to always run as administrator. Go to the folder where it is installed and in the Bin folder you’ll find the OpenVPN-GUI executable. On the Compatibility tab you find Privilege Level, set it to Run this program as an Administrator
In your the parent folder find the config folder and open the config file. Add the following lines to the file.