UE 5.4.2 and every other version keeps crashing on startup.

Hey there @NanoPixel! Welcome back to the community! Since the error is shader related, the issue is graphical in nature, so I think your actions thus far were basically most of where I’d start with debugging an issue like this. Blue screen of death is actually rather concerning in this situation, what’s the error code the blue screens produce?

Also you can change the RHI from outside of the engine, but if all other versions are crashing it’s not likely to work.

Armoury Crate could definitely be at fault, though I don’t have enough experience with the software to say for certain. Is there any way you could entirely disable it in the meantime for testing? It’s possible the drivers are having issues. You’ve done a chunk of this thread, but take a look over here at some possible resources: