Hi,
Hope everything is going well.
1,KB2267602 is the daily Defender virus definitions update, it can be troublesome to install sometimes, you can download the latest version from the link below, scroll near the bottom of the page, and download the 64bit version of 'Microsoft Defender Antivirus for Windows 11, Windows 10, Windows 8.1, and Windows Server' and use that to install the latest version.
Security intelligence updates for Microsoft Defender Antivirus and other Microsoft antimalware
2,You can also run the update troubleshooter and reset the Windows Update Agent in below article on your Windows 11 computer to have a try.
Refer to: Windows Update - additional resources
Hope my answer could help you. Should you have any questions or concerns, please do feel free to contact me.
Best regards,
Simon
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