KB5132061 at a glance
What
A Windows 11 security update fails to install on some computers.
Cause
Not confirmed. No official statement from Microsoft.
Do
Try the six steps in order. If they fail, wait for the fix.
What is happening
KB5132061 is the November 10, 2026 security update for Windows 11 versions 24H2, 25H2 and 26H2. KB stands for Knowledge Base, the reference number Microsoft gives each update. It brings version 25H2 to build 26200.9974 and version 26H2 to build 26300.9974.
It is this month's security update for Windows 11, so it should not be skipped. If your organization uses Outlook, see our separate post on the Outlook flaw that attackers are using, which is fixed through the Office update.
On some computers the update does not install. The reported error codes are 0x800f0993, 0x80070306, 0x800f0989 and 0x800f0922. In these reports the installation can reach 99% and then fail, and trying again often does not help.
What is confirmed and what is not:
- Microsoft's support page for the update says Microsoft is not currently aware of any issues with it.
- Windows Latest reports that Microsoft is aware of the complaints and is investigating. Microsoft has not made an official statement.
- The cause is not confirmed. One suspected link is the Windows Sandbox feature. It rests on one user's logs, and another user had the error without Sandbox.
- Our own experience: on the computers we manage, the update installed without these error codes.
Is it safe to wait?
For a short time, yes, if the steps below do not work. No data loss has been reported from the failed installations, and the computer stays on its current build.
Waiting is a temporary measure, not a reason to skip the update. While you wait, keep Windows Update and your security software turned on.
This update can need two or more restarts because of a pending Secure Boot certificate update. An extra restart is not a failure.
What to try
Work through these steps in order. Stop as soon as the update installs.
- Restart the computer and try again. Allow extra restarts if Windows asks for them.
- Note the exact error code. Open Settings > Windows Update > Update history and write the code down.
- Turn off Windows Sandbox if it is on and you do not need it. Search the Start menu for "Turn Windows features on or off", clear Windows Sandbox, choose OK, restart, and try again.
- Download the update from the Microsoft Update Catalog and install it.
- Use the Windows repair option. Open Settings > System > Recovery and choose "Fix problems using Windows Update". It reinstalls the current Windows version and keeps your apps, files and settings.
- If it still fails, stop. Leave the computer on its current build, keep your other protections on, and wait for the fix from Microsoft.
What not to do
- Do not turn off Windows Update.
- Do not turn off or remove security software.
- Do not keep forcing the installation once the steps above have failed.
Common questions
- Why does KB5132061 fail to install?
- The cause is not confirmed. Windows Latest reports that Microsoft is investigating, without an official statement. A suspected link to the Windows Sandbox feature rests on one user's logs and is unconfirmed.
- Is it safe to wait if the update will not install?
- For a short time, yes. No data loss has been reported from the failed installations. Keep Windows Update and security software turned on, and wait for the fix from Microsoft.
- My computer restarted more than once. Did the update fail?
- Not necessarily. This update can need two or more restarts because of a pending Secure Boot certificate update. An extra restart is not a failure.
Sources
- Windows Latest, report on KB5132061 installation errors, November 11, 2026
- Microsoft, Windows release health
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