Windows 10: KB3081448 fails with error code 8007000d

SOunds like maybe a driver problem - try booting to Safe mode, then checking Device Manage.

 

LOL - Even Safe Mode doesn't load, no files are being loaded. It just says Loading Windows Files. Please wait...
Surely that's not a hard drive problem, because it worked fine on Win10, just now this is doing something.

EDIT: Windows 7 isn't stuck on boot, because I can just Ctrl+Alt+Del and it will reboot.

 

That sort of thing implies that there's a possible problem with the BIOS - try resetting it to defaults

 

Tried to load the system default's, still nothing.

One strange thing is that when i opened regedit (thanks for DaRT 7), I saw some AMD AHCI RAID registry keys. AMD?? My computer is Intel, and I use IDE disks.

Also, IMO - the motherboard is 8 years old, so chipset is kinda working strange. When I open the system recovery it says "Possible root causes = 1
The registry is corrupt."

If you were thinking of system restore, i would say no. (Error code 0x80070020).