If you're in possession of an ISO disc image file, the process of burning a DVD using Windows DVD Maker is almost complete. An ISO is an archive that contains a collection of files all properly formatted and ready to be burned to a DVD. They just have not yet actually been burned to a physical disc. Because the ISO already exists, the actual burning process takes seconds provided that you have a blank DVD ready to go.
Right-click on the ISO that you want to burn to DVD.
Click "Burn to Disc."
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Select your DVD burner's listing from the "Disc Burner" drop down menu.
Click "Burn." Your ISO will be burned to a DVD using Windows' native DVD making software.