Windows won’t start for you? The latest update may be to blame

Windows 11 updates They become a nightmare for thousands of users. A day after Microsoft released a patch to fix a bug caused by the latest update, a new report warns there’s more to come. The tech giant has reported that there is a bug that may have unexpected effects on your computer.

According to Computer beepingMicrosoft has confirmed that Windows 11 updates will be released starting August 29, 2025. cause authentication failures on some computers. In a post on its support website, the company mentions that affected users may experience errors when logging in or attempting to access the remote desktop. Even if you use the correct password, you may see messages like “Your credentials do not work.”

According to Microsoft, the most recent updates Windows 11 24h2 and 25h2 include additional protection that checks security identifiers (SIDs), a series of unique codes used by the operating system to identify users, groups, and devices.

“The SID is used to uniquely identify a security principal or security group. Security principals can represent any object that the operating system can authenticate.“

Windows uses SIDs for access control, permission management, and security auditing. If you have duplicate SIDs on your computer and you have already installed the latest update, the system will block authentication confirmations. This will be reflected in login errorsproblems when trying to access another computer using Remote Desktop or error messages when opening a network folder or printer.

Why doesn’t Windows 11 work after updating?

Duplicate SID problem occurs when a Windows installation is cloned and a unique SID is not generated. For example, if a technician cloned multiple computers to have the same system, but did not run the Sysprep tool to regenerate the SID, this error will appear sooner or later. This is most common on business computers, although home users can also suffer from this if they have sent their computer to support and the appropriate action has not been taken.

Before the August 2025 update, Windows allowed duplicate SIDs in some scenarios. Now, if it detects that two devices have the same ID, it will block authentication as a security measure.

The only solution to get rid of this error is reinstall windows or ask your system administrator to rebuild the system using Sysprep. There is also a way to prevent this using a custom Group Policy, although this method is only available for businesses and not home computers.

Duplicate SID error affects computers with Windows 11 24h 2h, Windows 11 25h 2h and Windows Server 2025. Those using Windows 10 won’t encounter this problem, although they will have to deal with other errors, such as a tool that prevents you from creating an ISO image to perform a clean install of Windows 11.