Virus definition files are updates for virus protection software to keep your virus protection software current and able to detect all of the latest computer viruses. Virus definition files for Windows computers running McAfee VirusScan are released daily.

    These instructions are for Windows computers running McAfee VirusScan version 8.5 or later.

    Computers that are using the Saint Mary's-provided versions of McAfee VirusScan should automatically update their virus definition files when you are connected to the Internet. These instructions are for manually updating your virus definition files to make sure you have the latest virus protection available.

    Note: These instructions will allow your computer to update its virus definition files from on or off campus. You can manually update your computer's virus definitions and VirusScan will still attempt to automatically update in the future.

    1. Visit
    2. If prompted, click I agree because Saint Mary's College has a PrimeSupport agreement with McAfee.
    3. Click on the .DATs tab near the top of the page (it may already be selected).
    4. Click on the XXXXxdat.exe link - the XXXX represents the version number of the XDAT file. (The Release Date listed for the file should not be longer than two days ago.)
    5. When prompted, choose to Save the file to a convenient location on your hard disk (such as your Desktop folder). This XDAT file will update your Saint Mary's-provided McAfee VirusScan software to the latest virus definitions to protect your computer from current viruses. You can close your web browser window when the XDAT has finished downloading.
    6. Double-click on the XXXXxdat icon (which should be on your computer's desktop unless you saved it in another location).
    7. A windows box will open. Click on the Next button. Several processes should then take place, including closing and re-opening VirusScan. When the files have been successfully installed onto your hard drive, you may get a box asking you if you want to restart your machine. If that is the case. make sure the "Yes, I want to restart my computer now" button is selected to reboot your machine. Click on the Finish button.
    8. Restart your computer.

    9. You may wish to scan your computer for viruses now that it has the latest virus definitions installed.

Last Modified February 11, 2014