The company I work for installed a couple of ACER PC’s.
Both of them stop working at the same time and had an the error of 0×00000050 (0x9BBAA945… , found information hidden in a forum about how to fix them which worked really well, so thought I would pass on the fix.
Remove the program called Acer ELock in safe mode (F8 on startup) reboot and it should spring into life…