Windows 10: Windows failed to install KB4586781 with error 0x800F0845.

I have successfully installed Win10 20H2 through the normal Update process on two PCs and thee Laptops. However, I have one PC that fails multiple times but backs out the change and recovers. Today I tried a full install via a Media Creation Tool USB Flash Drive on the problem PC. During the install attempt, I deleted the Windows partitions System, Reserved, Primary, and Recovery so its not some bad device driver or anything else on my hard drive.



I made it through the install up to the point it wants you to sigh on to you Microsoft account. Then it dies with a blue screen reporting a page fault from a non-paged address. I have run memory diagnostics with no errors. I use this PC every day with zero errors on the 2004 20H1 level of Windows 10.


After the failed install of 20H2, I reinstalled 2004 20H1 with no issues. After 2004 20H1 install completed, I tried Settings - Update again which failed, and backed out KB4586781. Here are the Event Logs with the install errors:



Installation Failure: Windows failed to install the following update with

error 0x800F0845: 2020-11 Cumulative Update for Windows 10 Version 2004 for x64-based Systems KB4586781.



The computer has rebooted from a bugcheck. The bugcheck was: 0x00000050 0xfffff28000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000006.

A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 13e51ec1-1520-4bb7-ad72-11c13683b610.

:)