Verifying that a Windows 10/11 (24H2 or 25H2 update) is fully and cleanly installed (no corruption, missing files, or partial upgrades) involves three layers of checks:
1️⃣ Version and build confirmation,
2️⃣ Component Store & System integrity tests,
3️⃣ Windows Update and Servicing health logs.

Here’s a complete, step-by-step way to check all of it:

1. Confirm the Installed Version and Build

Goal: ensure you’re actually running 24H2 or 25H2, not a partial install.

Option 1 — Using winver

1. Press Win + R, type: winver
2. You’ll see:
   • Version 24H2 → build ~26100.xxx
   • Version 25H2 → build numbers usually higher 26200.xxx

✅ Example output:

Windows 11
Version 24H2 (OS Build 26100.2314)

Option 2 — Using PowerShell

Run:

Get-ComputerInfo | Select-Object OsName, OsVersion, OsBuildNumber, WindowsVersion

or

systeminfo | findstr /B /C:"OS Version" /C:"System Boot Time"

You should see:

OS Version: 10.0.26100

If OsBuildNumber is 26100 or above → 24H2 is installed.

2. Check for Missing or Corrupt System Files

Step A — Run System File Checker (SFC)

Open Command Prompt (Admin) and run:

sfc /scannow

What it does: verifies all protected Windows files and replaces any that are missing or corrupted.

✅ Output meanings:

• “Windows Resource Protection did not find any integrity violations” → all good.
• “Found corrupt files and successfully repaired them” → minor issue, fixed.
• “Found corrupt files but could not repair some” → proceed to DISM (below).

Step B — Run DISM (Deployment Image Servicing and Management)

Run these three commands in sequence (Admin Command Prompt or PowerShell):

DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth

• /CheckHealth → quick check if corruption is flagged.
• /ScanHealth → deeper analysis.
• /RestoreHealth → repairs system image using Windows Update or local sources.

✅ Expected result:

“The restore operation completed successfully. The component store corruption was repaired.”

If it fails, check %windir%\Logs\DISM\dism.log for details.

3. Verify Windows Servicing and Update Health

A. Check Windows Update history

Open:

Settings → Windows Update → Update history

Look for:

• “Feature update to Windows 11, version 24H2 (or 25H2)” marked as Successfully installed.
• No Failed or Retry entries.

B. Check servicing stack and component store health

Run:

DISM /Online /Cleanup-Image /AnalyzeComponentStore

If output says:

“No component store corruption detected.” and “Component Store Cleanup Recommended: No” → the image is clean.

4. Optional Deep Checks

A. Verify boot configuration and partition health

Run:

chkdsk C: /scan

→ should report “Windows has scanned the file system and found no problems.”

B. Confirm recovery and system partitions

Run:

Get-Partition
Get-Volume

Ensure EFI, Recovery, and OS partitions exist and have no “RAW” or missing volumes.

C. Use Reliability Monitor

Run:

perfmon /rel

→ shows post-upgrade errors or installation failures (look for red X events around upgrade date).

5. Verify via Windows Event Log

Check if installation fully completed:

Event Viewer → Applications and Services Logs →
Microsoft → Windows → WindowsUpdateClient → Operational

Filter for Event ID 19 (“Installation successful”) and 44 (“Restart required”) around the update date.

✅ Summary — A Healthy Windows 24H2 / 25H2 System Should Show: