When did this issue begin to occur? If recently, system restore can be under consideration. Please use another CD or play the same CD on another PC as test.
You can also try going to the Start Menu - All Programs, you should find an entry - PC Help & Tools. Open that and click on Recovery Manager. Follow the instructions for Hardware Driver Reinstallation, and it should reinstall your DVD.
Meanwhile, it is strongly recommended to contact
HP tech support and ask them how to use the HP Recovery Manager on your copy of Vista to reinstall DVD driver.
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