I'm trying not to laugh but is it possible you don't have a DVD-ROM drive?
Literally look at the drive on the pc case if you don't see DVD anywhere on it, you don't have a dvd drive, if you do then its possible that you have to reinstall the dvd drive driver. And the other thing that I can think of is you don't have a DVD codec try downloading this
http://files.uberdownloads.com/software/video-player/VLC.html
just copy and paste the link in the address bar of your web browser, then click download. But seriously if you don't see DVD on your CD-ROM drive then don't bother to try any of it, you just need to buy and external DVD drive. If you want me to walk you through the steps of uninstalling and reinstalling your DVD drive driver e-mail me.
[email protected]
Hope this helps
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