Fix Windows Defender Error 1297 on Windows 11/10


When you try to launch the Microsoft Defender app or when you try to run a scan on your Windows 11 or Windows 10 computer, the app may fail to open or crash and then generate the error code. 1297. In this article, we identify the probable causes and provide the most appropriate solutions to the problem.

Error 1297 Windows Defender Error 1297
Error 1297: Windows Defender has encountered a problem and needs to close. We are sorry for the inconvenience.

Fix Windows Defender Error 1297

If you get the Windows Defender Error 1297 When trying to launch the application or while running a scan on your Windows 11/10 device, you can try our recommended solutions below in no particular order and see what works for you to fix the error. Make sure your PC is updated and see if the error recurs – before trying the solutions listed below.

  1. Start SFC scan
  2. Fix issues in clean boot state
  3. Reset Windows Security
  4. Perform System Restore
  5. Reset Windows 11/10

Let’s take a look at the description of the process involved regarding each of the listed solutions.

1]Start SFC scan

Start SFC scan

The Windows Defender Error 1297 that triggers on your Windows 11/10 PC might be due to corrupted system files. In this case, you can start troubleshooting by running an SFC scan on your device and see if that fixes the problem.

The sfc/scannow The command will scan all protected system files and replace corrupted files with a cached copy located in a compressed folder at %WinDir%System32dllcache. In most cases, if certain Windows functions aren’t working or Windows crashes, use System File Checker to scan Windows and restore your files.

2]Clean Boot State Troubleshooting

Fix issues in clean boot state

Third-party apps and services can interfere with the proper functioning of Microsoft Defender on your system, hence the highlighted error. So you can troubleshoot in the Clean Boot state and see if the current issue is resolved. If in this system state Windows Defender opens and runs fine without crashes or issues, then you may need to manually activate one process after another and see which offender is triggering the prominent error on your device. Once you identify it, you should disable or uninstall the software that uses this culprit process.

Also make sure that no other security software is installed and running on your device – if so, you can uninstall the third-party security software using the dedicated AV removal tool for remove all files associated with your anti-virus program – you can also use any freeware uninstaller software.

Lily: Windows Defender error 0x800700aa, the service could not be started

3]Reset Windows Security

Reinstall Windows Defender

If Windows Defender won’t open or crash during normal operations, as it does here, the app may be suffering from a temporary issue or may be corrupted. In this case, an effective solution will be to reset Windows security or reinstall Windows Defender on your PC.

Lily: Windows Security in Windows 11 not opening or working

4]Perform System Restore

Perform System Restore

If the Windows Defender app was working normally until now, it’s entirely possible that the problem was made easier by a change your system recently underwent that you aren’t aware of.

Since you have no idea what changed that might have broken Windows Defender’s functionality, you can use System Restore to roll back to a date when you’re sure the app was working properly. Keep in mind that all changes such as app installs, user preferences, and anything else done after the restore point will be lost.

To perform System Restore, follow these steps:

  • Hurry Windows key + R. to invoke the Run dialog box.
  • In the Run dialog box, type rstrui and press Enter to run the System Restauration Wizard.
  • On the initial System Restore screen, click Next.
  • On the next screen, check the box associated with Show more restore points.
  • Now select a restore point before the time when you noticed the problem on your device.
  • Click on Next to go to the next menu.
  • Click on Finish and confirm at the last prompt.

The next time you start the system, your computer’s old state will be applied. The current issue should be resolved now. Otherwise, try the next solution.

Lily: List of Microsoft Defender Error Codes and Solutions

5]Reset Windows 11/10

Reset Windows 11/10

At this point, if the issue you are currently facing is not yet resolved, it is safe to assume that you might be experiencing severe system file corruption or possibly a damaged or bad system image, which will affect in all cases Windows Defender as it is an integral part of the Windows operating system. In this case, a viable solution is to reset Windows with the option to keep your personal files.

Hope that helps!

Similar item: Windows Defender application failed to initialize, error code 0x800106ba

Can you reinstall Windows Defender?

If Windows Defender is not working properly or missing from your Windows 11/10 computer, you can reinstall it in minutes and without any technical skills. You don’t need a disk to install Windows Defender. Simply visit Settings and select Repair or Reset options.

How secure is Windows Defender?

As a free service, Microsoft Defender does a good job of securing your Windows devices. In testing, it achieved a 98% detection result for real-time malware – an excellent result for a completely free service.

Will Windows Defender detect malware?

Yes. Microsoft Defender Antivirus is an inbuilt malware scanner for Windows 11/10 operating system. As part of the Windows security suite, it will search for any files or programs on your computer that could be causing harm to it. Defender searches for software threats such as viruses and other malware in email, apps, the cloud, and the web. If necessary, you can periodically download and run Microsoft Safety Scanner.

Is it okay to run Windows Defender and McAfee at the same time?

You cannot enable McAfee and Defender at the same time to protect your system. You can only enable one AV protection at a time to protect your computer. Also, installing third-party AV software will automatically disable Windows Defender on your PC.


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