@Megalomaniak said:
What's it come down with?
Fixed now, but here's a rundown: (TL;DR below)
One day, i get home to see it sitting in BIOS. Weird, but I've seen it before, particularly after a power outage. And it was REALLY windy that day; figured a transformer went down for a bit and knocked the thing out. So I tell it to boot into Windows. It then boots, but back into BIOS. Huh? Tried again, back into BIOS. This is odd...
Looked at the clocks, they were all accurate. No power outage today. Uh-oh.
Started doing some research and, after finding a lot of fear-mongering "YOU HAVE A TROJAN!!1!" articles, I turn it off and let it rest for a bit. I boot it up later and lo and behold, it's back into Windows. Thinking it's fixed, I go to bed. Wake up, and it's in BIOS again, caught in a boot loop. Damn it. So I turned it off and went to work. Got home, and turned it on. Was on it for a few hours when it suddenly BSOD'd on me before BIOS-looping, finally giving me an error code to figure out: critical_process_died.
Turns out, Windows kinda gave up on its registry processes and decided to tell me to F myself. The only fix was a full reinstall, which took me like a week because of all the backup-shuffling I had to do with my relatively tiny external drive. But finally, I got a fresh Win10 booted up, important files in two extra places (a backup PC and a Google Drive), and thus far, no BSOD.
TL;DR: My 3.5-year-old Windows install got sick of looking at its registry and resorted to shunting itself into BIOS loops, forcing a total reinstall.