This download includes 32-bit and 64-bit.
NOTE: To install a file on a Windows Vista-based computer, right-click the file, and then click Run Save as Administrator to install it.
When the definition file is run, a file extraction dialog box appears. This dialog box indicates that the definition update is being installed. After the file extraction dialog box closes, you can verify that the Windows Defender definitions have been updated. To do this, open Windows Defender and check the definition version listed in the bottom box of the Windows Defender Home dialog box.
Enterprise customers should use Windows Server Update Services (WSUS) version 2.0 or later to distribute Windows Defender definition updates. However, these customers can also use user logon scripts to manually install a definition update by running a Windows Defender definition update file.
Note: To use this definition update, you must confirm that Windows Defender is installed on your computer.
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