So I moved the xlive file and still no joy.
After searching ‘dxvk::DxvkError’, I came across this thread:
[https://www.reddit.com/r/archlinux/comments/17mvyyy/terminate_called_after_throwing_an_instance_of/]
And although the op only had AMD Gfx it mentioned nvidia and reinstalling the drivers, so I thought, what the heck.
So searching and finding this thread:
https://forum.garudalinux.org/t/how-do-i-install-nvidia-drivers/30919
I reinstalled the nvidia drivers but this time used the second command:
sudo pacman -S garuda-nvidia-prime-config
And this time I now have Fallout 3 GOTY running, played the first couple of minutes - watching the intro videos - so success I guess.
I’ll look out for a more up to date Gfx Card - any recommendations?