how to uninstall update kb:5122878

Question

how to uninstall update kb:5122878

Jorge Avila 0

This update regularly freezes my pc needing a restart

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2 answers

Your answer

Answer 1

Uninstall KB5122878 through Settings > Update & Security > Windows Update > View update history > Uninstall updates, or use Windows Recovery Environment if freezing prevents normal access.

Uninstall while Windows is usable

Save your work and close applications.
Select Start > Settings > Update & Security > Windows Update.
Select View update history > Uninstall updates.
Select Security Update for Microsoft Windows (KB5122878).
Select Uninstall, approve the prompt, and restart the PC. Microsoft notes that some updates cannot be uninstalled.^1^

Removing a security update also removes its security protections. After restarting, test whether the freezing has stopped.

If the PC freezes before you can uninstall it

At the Windows sign-in screen, hold Shift while selecting Power > Restart.
In Windows Recovery Environment, select: Troubleshoot > Advanced options > Uninstall Updates.
Select Uninstall latest quality update.
Complete the prompts and restart. This recovery option does not remove personal files or applications.^2^

If Windows cannot reach the sign-in screen, interrupt startup twice by holding the power button as Windows begins loading. On the third startup, Windows should enter recovery; then use the same Uninstall Updates path.

Prefer a newer cumulative update when possible

KB5122878 is the September 8, 2026 cumulative security update for Windows 10 21H2/22H2. Microsoft resolved certain KB5122878 issues in KB5129236, released September 14, and in later cumulative updates.^3^

After uninstalling and regaining stability:

Open Settings > Update & Security > Windows Update.
Select Check for updates.
Install the newest cumulative update offered rather than reinstalling KB5122878 alone.
Restart and test the PC.

The officially documented KB5122878 issues include Remote Desktop Services becoming unresponsive and certain USB Audio Class 1.0 problems; the documentation does not establish general PC freezing as a known KB5122878 issue.^4^

If the freezing continues after removal, the update may not be the cause. Record whether there is a blue-screen stop code and check Device Manager for devices marked with an exclamation point before changing anything else.

References

Answer 2

Hi Jorge Avila,

Since the freezing appears after KB5122878 is installed, but general system freezing is not listed among the documented issues mentioned for this update, it would be useful to capture more information about what happens at the time of the freeze.

Please check Reliability Monitor after the next occurrence:

Search for View reliability history from Start.
Look for a critical event at the time the PC froze or restarted.
Open it and note the application, hardware, or Windows failure shown.

If you can share the error name/code and technical details shown there, that may help narrow down whether a driver, application, or Windows component is involved.

If the behavior consistently returns only after this particular update is installed, you can also report the occurrence through Feedback Hub (Windows + F) so the diagnostic information can be submitted for investigation.

Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas.

I hope this helps move the troubleshooting forward.