If you see Windows update error 0x80070641 and maybe see Windows Installer Service could not be accessed message, the see this post.

These aren't like your chipset or graphics drivers where you can (and should) update them yourself, but fortunately, Windows has a built-in scan tool to help fix file system and Windows driver errors.

If you encounter Windows Update Error 0x800F0840 on Windows 11/10 or Windows Server, follow the solutions mentioned in this post.