Support for Windows 7 ended on January 14, 2020
We recommend you move to a Windows 11 PC to continue to receive security updates from Microsoft.
Resolution
Note: Microsoft Security Essentials must already be installed to use the latest virus and spyware update definitions. Note that Windows XP, Windows Vista, and Windows 7 are out of support, Microsoft Security Essentials is no longer available to download. However, Security update definitions will still be available for a period of time.
Before you install the latest version of the Microsoft Security Essentials virus and spyware definition updates, you must know:
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Whether your version of Windows is running in a 32-bit or a 64-bit operating environment.
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Whether you are logged on to Windows as an administrator.
Then follow these steps:
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Download the Microsoft Security Essentials virus and spyware definition update file that is appropriate for your version of Windows:
Important: You must be running a 64-bit version of Windows to run a 64-bit version of Microsoft Security Essentials. The 64-bit versions of Windows include x64-based versions of Windows.
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Click Run to install the definition update file immediately. Or, click Save to save the file to the computer. If you click Save, remember the folder where you saved the file.
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To install the saved file, follow these steps:
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Windows XP
Double-click the file, and then click OK. -
Windows Vista or Windows 7
Right-click the file, and then click Run As Administrator. If you are prompted for an administrator password or for confirmation, type the password, or click Continue.
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When the definition update file runs, a file extraction dialog box appears. 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.