0x8000FFFF

Windows Update error 0x8000FFFF

Additional symptoms:

• sfc /scannow stuck at 7% and cannot complete.
• mmc.exe - app locked
• Able to run mmc.exe from Power Shell run as Administrator

It looks like strange Windows files corruption.

Try to fix:

• bitsadmin.exe /reset /allusers
• chkdks /r
• ICACLS C:\Windows\winsxs
• ADW Cleaner

• Servicing Stack Update
  • systeminfo - check Windows version
  • Latest SSU Updates
  • Install KB4586864

• Smart Fix
  • It installs Windows RE and integrate it into boot menu
  • Cannot works with QEMU SCSI Virtual Controller!

• Sfc /scannow stops on Windows 10 [BEST SOLUTIONS]
  • FIX: DISM failed on Windows 10

Anty malware tools:

• Farbar Recovery Scan Tool FRST

DISM:

Dism.exe /online /cleanup-image /scanhealth
Error: 4448
Sterownik WOF napotkał uszkodzenie w tabeli zasobów skompresowanego pliku.

Found hints on Internet:

Dism.exe /online /cleanup-image /restorehealth
 
REM or
REM use WIN10 installation CD-ROM as drive F:
REM First list all images inside instalaltion CD:
dism /Get-WimInfo /WimFile:F:\sources\install.wim
REM remember index of your installation, i.e. 6 for Win 10 Pro
dism /Online /Cleanup-Image /RestoreHealth /Source:WIM:F:\sources\install.wim:6 /LimitAccess
 
REM or
REM mount Windows folder from another healthy system as Y:
Dism.exe /Online /Cleanup-Image /RestoreHealth /Source:Y:\ /LimitAccess

doesn't help, the same error.

Dism.exe /Online /Cleanup-Image /StartComponentCleanup
Dism.exe /Online /Cleanup-Image /AnalyzeComponentStore
sfc/scannow
Dism.exe /Online /Cleanup-Image /RestoreHealth
sfc/scannow

https://www.wintips.org/fix-dism-source-files-could-not-be-found-windows-10-8/