Windows 11

Windows 11 KB5066835 issues and how to fix them safely

Md Fakharuddin

Md Fakharuddin

— 3 min read
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A Windows 11 desktop computer displaying an update notification on the screen.

Installing the Windows 11 KB5066835 update can cause system crashes, slow performance, and error messages due to compatibility or installation issues. To fix these problems, start by restarting your PC and running system scans. If issues continue, uninstall the update to restore normal operation safely.

What problems does KB5066835 cause on Windows 11? [symptom]

Users report several issues after installing KB5066835, including:

- Unexpected system crashes or blue screens
- Slow boot times and general lag
- Error messages like "Stop Code: DRIVER_IRQL_NOT_LESS_OR_EQUAL"
- Frequent app hangs
- Network connectivity problems
- Printing errors
Symptom

These symptoms usually appear right after installation or following the first reboot. They often relate to system files or driver conflicts introduced by the update.

How to confirm KB5066835 is causing your PC issues [applicability]

This applies to Windows 11 users who installed KB5066835 and started experiencing problems. You need Administrator privileges to uninstall updates or run system checks. A restart is often required after fixes.

Before troubleshooting, check if KB5066835 was installed around when the issues appeared:

  1. Open Settings > Windows Update > Update history and look for KB5066835.
  2. Open Event Viewer (type "Event Viewer" in Start) and check Windows Logs > System and Application for errors or warnings tied to system files or drivers dated after the update.

If errors mention recently updated components or the problems began immediately after installing KB5066835 without other software changes, the update is likely the cause.

Follow these steps in order, with Administrator privileges:

  1. Restart your PC if you haven't done so already.
  2. Run a system file check to repair corrupted files:
sfc /scannow
Command Prompt

This scan will identify and fix damaged system files. If errors persist, proceed to uninstall the update.

  1. To uninstall KB5066835:
  • Go to Settings > Windows Update > Update history > Uninstall updates.
  • Select KB5066835 and click Uninstall.
  1. Restart your PC after uninstalling.
  2. If uninstalling isn’t possible or doesn’t fix the problem, run the Windows Troubleshooter:
  • Open Settings > System > Troubleshoot > Other troubleshooters.
  • Run relevant troubleshooters like "Windows Update" or "Blue Screen."

These steps prioritize safe, reversible fixes without risking data loss or major system changes.

A Windows 11 desktop computer with command prompt open running system file check.

How to verify your fixes worked and KB5066835 status [verify]

After applying fixes, use your PC normally to confirm the issues have stopped.

To check if KB5066835 is installed or removed:

  • Open Settings > Windows Update > Update history. If KB5066835 is listed under "Installed Updates," it remains installed. If you uninstalled it, it should not appear there.
  • Alternatively, open PowerShell as Administrator and run:
Get-HotFix -Id KB5066835
PowerShell

If information about the update appears, it’s installed. If you get an error or no output, the update is not present.

Finally, review Event Viewer again for any new errors related to the update. Persistent errors mean you should retry fixes or seek further troubleshooting.

How to avoid update issues like those from KB5066835 in the future [prevent]

To reduce update problems:

  • Create a system restore point before installing updates. Search "Create a restore point" in Start, then click "Create" on the System Protection tab.
  • Keep device drivers updated from trusted sources before applying Windows updates.
  • Wait a few days after an update’s release before installing it, allowing time for bug fixes.
  • Regularly back up important files to protect against data loss if troubleshooting requires more extensive measures.

Conclusion

If KB5066835 causes issues, start with a reboot and system scan, then uninstall the update if needed. Confirm your fixes by checking system stability and update status. For future updates, create restore points, update drivers beforehand, and delay installing new updates until they’ve been tested. These steps help keep your Windows 11 PC stable while staying current.

Frequently Asked Questions

Can I reinstall KB5066835 after uninstalling it?

Yes, you can reinstall KB5066835 later, especially if Microsoft releases a fix for the issues. Use Windows Update to check for and install it when you’re ready.

Will uninstalling KB5066835 remove my personal files?

No, uninstalling this update only removes the update itself. Your personal files and apps remain unchanged.

What should I do if uninstalling KB5066835 doesn't fix my problems?

If uninstalling doesn’t resolve the issues, try running the Windows Troubleshooter or performing a system restore to a point before the update. If problems continue, more advanced troubleshooting or professional support may be necessary.

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