Gotcha. You mentioned you put the PC into Recovery Mode and tried to reinstall Windows, but it didn’t work. What happened that prevented the re-installation of Windows? Did the PC just shutdown during installation, or were you wholly unable to get the Windows installer to run?
If you’re still able to boot into Recovery Mode/Safe Mode, try opening up a Command Prompt and running the SFC Scan and DISM commands outlined here: https://www.howtogeek.com/222532/how-to-repair-corrupted-windows-system-files-with-the-sfc-and-dism-commands/
I don’t watch a lot of creepy/spooky stuff, so my recommendations come from a fairly limited breadth. That said, I recommend a few things that many might lump under “kid movies” (I prefer the more accurate label “family entertainment”) since they tend to be perilous and unsettling without being outright violent, gory, or generally miserable.
Coraline (2009) - A young girl, dissatisfied with her home life after moving to a new town, stumbles upon a dark, parallel world. Therein, she finds solace in a parallel version of her mother who is not what she seems.
Paranorman (2012) - A young boy who can speak with the dead learns that a witch who was executed by the townspeople hundreds of years ago will soon return to seek vengeance upon them.
Over the Garden Wall (2014) - A mini-series focusing on two brothers who find themselves inexplicably lost in a forest teeming with fell beasts, witches, undead, and unlikely allies. I watch this one every year around this time. Cozy yet spooky at the same time.