I have a similar issue.
WRC crashes (computer turns off and restarts) when I'm in the main menus, after a few corners, even with the graphics at the lowest settings possible (with an RTX 3090 and i9 10850K)
I get a "kernel-power 41 (63)" error code.
Also, WRC is not registering as a game in "Geforce Experience" and I cannot get the FPS to display when in this game.
I have checked all my drivers, BIOS, scanned and fixed some registers, conducted stress testes to confirm that the GPU, CPU and memory is working ok, but after around 12 hours wasted I still can't use this game.
I would be greatfull to anyone who can provide suggestions on how this can be fixed.