DVD device driver missing

im trying to do a clean install of Windows 7 Home Premium x86 (final RTM version) on my dad's mini-ITX build but i am getting an error message that says "DVD device driver is missing" please install driver yadda yadda. but where in the world do i get a DVD driver? its booting off the DVD drive for christ sake! the drive IDE and not SATA. according to my Googling that may be part of the problem but i don't feel like buying a new drive. any solutions?

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