You should download the latest virus definition files.






















Microsoft continually updates security intelligence in antimalware products to cover the latest threats and to constantly tweak detection logic, enhancing the ability of Microsoft Defender Antivirus and other Microsoft antimalware solutions to accurately identify threats.

This security intelligence works directly with cloud-based protection to deliver fast and powerful AI-enhanced, next-generation protection. Microsoft security intelligence updates include software that incorporates material from third parties. Third-party notices and information. Automatic updates. To help ensure your antimalware solution detects the latest threats, get updates automatically as part of Windows Update.

If you are having problems with Windows Update, use the troubleshooter. If you don't already use Microsoft Defender Antivirus, learn how to turn it on. Trigger an update. A manually triggered update immediately downloads and applies the latest security intelligence. Yes No. Home Solutions. How can we help you today?

Enter your search term here New support ticket. Check ticket status. The dialog box indicates that the definition update is installing. After the file extraction dialog box closes, you can verify that the virus and spyware definitions were updated. To do this, open Microsoft Security Essentials, click Update , and then examine the virus and spyware definitions status. To resolve an issue in which Microsoft Security Essentials does not update automatically, go to the following Microsoft website: Troubleshooting update issues for Microsoft Security Essentials.

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