There could be multiple reasons why the DVD is not working like the DVD might have been corrupted, you might be having CD drive and trying to read DVD, or the DVD is not inserted correctly and so on.
You can install the trial version from the below link and use your serial number to activate:
Have you submitted your product code already to obtain your serial number? Please make sure you have submitted your proof of eligibility. You can find additional details at http://forums.adobe.com/message/4634728#4634728.