Quick fix: Open Command Prompt (Admin). Run these in order: dism /online /cleanup-image /restorehealth (15-30 minutes), then sfc /scannow (5-15 minutes), then reboot. DISM repairs the Windows component store (system source) first, so SFC’s file replacement uses a healthy source. Running SFC before DISM may fail to find good copies.

SFC (System File Checker) scans Windows system files for corruption and replaces them with known-good copies. DISM (Deployment Image Servicing and Management) verifies and repairs the Windows component store (where good copies live). Run together for max repair.

Symptom: Want maximum-effect repair of Windows 11 system files via SFC + DISM.
Affects: Windows 11 (and Windows 10).
Fix time: ~30-45 minutes total.

What causes this need

System file corruption can cause:

Random BSODs.
App crashes for no reason.
Failed Windows updates.
Boot failures (rare).
Functionality oddities (Start menu broken, search not working).

SFC + DISM is the standard repair sequence. Run DISM first to ensure the component store (the source for SFC’s replacements) is healthy.

Method 1: Run DISM first, then SFC

The standard route.

Open Command Prompt (Admin). (Right-click Start → Terminal (Admin) → switch to cmd if needed.)
Run DISM:
```
dism /online /cleanup-image /restorehealth
```
Takes 15-30 minutes. Downloads needed files from Microsoft if local component store is corrupted.
Watch progress. Doesn’t move smoothly; may pause at 60-80% for several minutes.
If DISM succeeds: “The restore operation completed successfully.”
If DISM fails: see Method 3 for sourcing from Windows ISO.
Now run SFC:
```
sfc /scannow
```
Takes 5-15 minutes. Scans system files; replaces corrupted ones from component store.
If SFC finds issues: “Windows Resource Protection found corrupt files and successfully repaired them.”
Reboot. Test if symptoms resolved.

This is the standard sequence.

Method 2: Verify component store health first

For knowing what to do before running.

Before full repair, check current health:
```
dism /online /cleanup-image /checkhealth
```
Quick check. Reports if component store has known corruption.
For deeper check:
```
dism /online /cleanup-image /scanhealth
```
Takes longer. Scans component store thoroughly.
If checkhealth/scanhealth reports issues: run /restorehealth.
If both report healthy: SFC alone is enough. Run sfc /scannow as a smaller repair.
For specific component issues: dism /online /cleanup-image /restorehealth /Source:WIM:D:\sources\install.wim:1 /LimitAccess (if you have ISO mounted at D:).
For Insider builds: keep using /online /cleanup-image; same syntax.

This is the diagnostic step.

Method 3: Use offline source for DISM

For when /restorehealth can’t download (offline / restricted network).

Download Windows 11 ISO from microsoft.com/software-download/windows11.
Mount the ISO: right-click .iso → Mount. Note drive letter (e.g., F:).

Run DISM with offline source:

dism /online /cleanup-image /restorehealth /source:wim:F:\sources\install.wim:1 /limitaccess

F: is the mounted ISO drive. install.wim:1 is image index 1.

/limitaccess prevents fallback to online; uses only the ISO source.
Useful for: airgapped corporate PCs, slow/unreliable Internet, when Microsoft servers are temporarily unreachable.
For ESD format ISO: use install.esd instead of install.wim.
For multiple image indices: dism /Get-WimInfo /WimFile:F:\sources\install.wim. Pick matching edition.
After DISM completes: run SFC as normal: sfc /scannow.

This is the offline-source route.

How to verify the fix worked

DISM reports: “The restore operation completed successfully.”
SFC reports: either “found no integrity violations” (already clean) or “found corrupt files and successfully repaired.”
CBS log shows details: %windir%\Logs\CBS\CBS.log. Search for repair entries.
Symptoms (BSOD, crashes, broken features) reduced or gone.
Re-run dism /online /cleanup-image /checkhealth — reports healthy.

If none of these work

If DISM fails: Network issue: try VPN or different connection. Windows Update components broken: separate repair: net stop wuauserv && net stop bits && ren %systemroot%\SoftwareDistribution SoftwareDistribution.old && net start wuauserv && net start bits. Then retry DISM. If SFC reports corrupt files but can’t repair: insufficient component store source. Use Method 3 with offline ISO. For chronic corruption: physical disk issue. Run chkdsk /f /r C: to verify drive health. For persistent BSOD: hardware issue (RAM, GPU). Use Windows Memory Diagnostic + driver checks. Last resort: In-Place Upgrade: mount Windows 11 ISO → run setup.exe from within Windows → pick “Keep files and apps.” Reinstalls Windows while preserving user data.

Bottom line: Run dism /online /cleanup-image /restorehealth first (provides healthy source), then sfc /scannow. Reboot. Use offline ISO source if DISM can’t download.