We are talking about VPN in Windows XP. This operating system is used on old and therefore low-powered computers. Using Windows XP on a much more up-to-date computer as a real. main operating system does not make sense at all for many reasons. OpenVPN on an old, underpowered computer is a total disaster. The OpenVPN client has a much too high CPU load, and thus the connection speed is beyond good and evil. So, only the native protocols L2TP/IPSec and PPTP remain. And, these protocols have been discontinued by very many VPN providers or they offer L2TP in a newer version that is no longer compatible with the native L2TP protocol of Windows XP. This is unfortunately the truth. I know almost everything about VPN in Windows XP and have appropriate licenses with the few remaining vendors. Here is my advice based on 20 years experience with VPN in Windows XP: Forget about all free VPN services! Very low speed, in many cases no stable connections, no privacy, no security, and definitely a lack of a "no log policy". All those, who use Windows XP on a more up-to-date and relatively powerful computer as their real, main operating system, can actually no longer be helped anyway.
Cheers, AstroSkipper