Chrono, can i assume that it's an old computer?
"NVRAM update failed" is a symptom that the flash memory chip on the motherboard has literally worn out. In addition to the BIOS code, the NVRAM contains the Windows Plug-and-Play data.
EVERY time Windows boots up, it updates the NVRAM, whether the NVRAM contents have changed or not.
My suggestion is that you might just change the entire mobo
Hardware Can't boot pc. Hang after "NVRAM checking", NVRAM update failed