Knowledge base
Knowledge base
Start with the symptom, protect important data and choose the guide that matches the actual failure stage.
Specific guides
Choose the symptom you recognise
Windows 11 will not boot: safe recovery steps
Safe first-aid guide for a PC that powers on but does not reach the Windows 11 sign-in screen.
→Repair Windows offline with DISM and SFC from WinRE or Windows PE
Practical guide to checking and repairing an accessible but non-booting Windows installation with offline DISM and SFC.
→Remove a Windows update through WinRE or Windows PE
Safe guide that starts with WinRE and limits manual offline removal to an exactly identified registered package.
→Install a Windows update offline with DISM from Windows PE
Specialist guide for a confirmed interrupted Windows update, including package selection, verification, logging and stop conditions.
→Repair EFI and BCD with BCDBoot
Careful guide for a missing or damaged Windows boot path, including identification and backup before BCDBoot.
→Investigate and repair stop code 0xC000021A in Windows 11
Staged diagnosis for 0xC000021A without assuming one file, driver or update is the cause.
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