reply 2, THIS LINK has some vpn software that is supposed to work with xp
Since Mullvad began faltering on XP about 8 months ago I switched to ExpressVPN (ca. $100/year, all in all affordable) and so far I'm satisfied: reasonably fast, discreet, unobtrusive, doesn't look like it's owned by any of the most invasive web tycoons or government agencies.
reply 3,
below links have tips for setting up vpn's if you need these:
https://www.lifewire.com/set-up-vpn-connections-windows-xp-818184
https://www.lifewire.com/create-new-vpn-connections-in-xp-818255