Hi @RBNMN,
I just, as in not 10 minutes ago, had this exact same thing. The installation and packages for nvidia have changed, quite onviously.
In my case, and I’d suspect your case something similar would be necessary, I had to remove the conflicting packages so that the nvidia utils packages can be removed, and then replaced by nvidia-utils:
sudo pacman -R nvidia-455xx-utils
sudo pacman -R lib32-nvidia-utils
sudo pacman -R linux54-nvidia-455xx
sudo pacman -S nvidia-utils
sudo pacman -S linux510-nvidia
sudo reboot
After which, I reinstalled the driver with mhwd:
sudo mhwd -l
sudo mhwd -i video-nvidia
reboot
Or so I think.
Anyway, that’s the gist of it, if not the exact steps.
I hope this helps.