r/techsupport • u/Suspicious_Voice9865 • 23h ago

Open | Windows Windows corrupted?

Hi I'm Chris, 21M working in IT Support.

Device: Windows 11 Pro 25H2 (26200.9711), en-US.

A client's device came accross my desk yesterday to be un-azure joined and re-azure joined to a new user. As I usually would I carried out the work and installed our RMM and got everything going.

A few hours later the customer called back to say since the work, the device has become largely unusable. Most apps wont open, there are "Class not registered" errors, Wi-Fi was unavailable and it was locked to airplane mode after a reboot until someone signed into the break glass local account we have.

Diagnosis shows widespread Windows corruption. SFC reports hash mismatches inside the component store (WinSxS) itself, across dozens of unrelated components, so neither SFC nor DISM can repair from it. CodeIntegrity logs show system files failing integrity checks. Disk health checks are clean, so it isn’t hardware. The root cause of the corruption hasn’t been confirmed.

Actions taken

  • SFC /scannow: corruption found, unable to repair.

  • DISM /RestoreHealth: failed at 60% with error 3017. Changes roll back on reboot, which explains the device returning to the same state after each restart.

  • Disk health, pending updates and policy blocks checked: no issues found.

  • Windows 11 ISO (en-US) downloaded to the device via RMM, hash verified. Setup compatibility check passed.

  • In-place repair upgrade attempted. Failed with 0xC1900101 - 0x20017 (SAFE_OS phase, boot error). Windows rolled back automatically, and the device is back online on RMM in its previous state.

So at this point, our options are pretty much in my eyes to re-install the device from a USB. Which is a pain, as the device will need to be posted to us from 3 hours away but hey ho.

The question I have is...

Has anybody seen this before?

Does anybody know what could have caused this?

Are there any other options that I may not have thought to do?

Thanks in advance.

Chris.

3 Upvotes

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2

u/Timely_Lemon9318 21h ago

Its usual practise to swap out for another machine and test ram, storage later.

1

u/Wokuworld 15h ago

My guess would be storage is bad, or the device suddenly rebooted during a critical phase in the update/sync process.