Download latest stable version of openvpn client for your operation system here. For Windows XP you should select one as on the picture:
Ensure Windows version and 32 or 64 bit. For Windows XP usually 32 bit.
Some antiviruses can block complete openvpn installation. We would recommend to disable it while installation will not finish.
Double-click on downloaded package.
Select "I Agree":
Enable your antivirus if you disabled it on 2nd step.
Next step is to get openvpn configuration files from you client area on https://boxpn.com/fr/cabinet/openvpn-configs. You will find a lot of available configs for different servers worldwide you can connect to. For example, lets get this (you should get ones you want to connect to):
Double-click on "OpenVPN GUI" icon (as admin user):
You will see new icon on your Taskbar. Click on it, select openvpn configuration profile you would like to connect to and select "Connect":
Fill your credentials information:
You will see green status icon and message:
Now all your traffic is secure and you are 100% anonymous!