As system get more complex they get more fragile. That is definitely the case when it comes to computer and information systems. I found that out again last Friday. Now as of now, I don’t know if what happened to my main computer is a hard drive failure or a corrupted update. At this point it’s hard to tell and it’s going to be some work to figure out what. My big mistake this time was not making a Windows 10 boot disk.
https://www.xtremerain.com/fix-bad-system-config-info/
System failure can also be caused by malware and viruses though this has been less common as the security people have dealt with this sort of thing and if the data and files themselves are not wrecked, using a boot disk can get things running and work around the malware until things are running, anyway, here’s the week in ransomware.
https://www.bleepingcomputer.com/news/security/the-week-in-ransomware-april-28th-2017-cerber-mordor-and-cve-2017-0199/