Hi,
My name is Igor, it's a pleasure for me to help others and I'll try to help you.
Did you turn off your PC forcible by holding power button pressed? If not, Kernel-Power 41 (63) error mostly means the problem with power supplying. Can you replace power supply unit for checking? It may mean problems with power management in BIOS or motherboard too.
And you may try to turn off all CPU power saving modes in BIOS (different C states) to check if the problem is in motherboard.
See some details at https://docs.microsoft.com/en-us/windows/client...
As for 257, typically, this bug check occurs when the processor is nonresponsive or is deadlocked. This may be result of power fault.