My MBPro will only play certain DVD's

My MacBook Pro will not play third party DVD's such as Dragon Dictate but will play Apple DVD's and DVD's that I have burned. I get the message I get is "The disk you inserted was not readable by this computer." think this  started after the recent system update to 10.7.3. I tried the DVD in onother MacBookPro that did not have the system software update and had no problems. I downloaded the combo update and re-installed the system software but this did not correct the problem.
Where do I go from here?
Peter

Peter Edwards1 wrote:
Where do I go from here?
Re-set the SMC
Intel-based Macs: Resetting the System Management Controller (SMC)
<http://support.apple.com/kb/HT3964>
If that doesn't work, try, as dominic23 said, using a lens cleaning disc. If that doesn't work either, and if the machine is still under warranty, take it to the Apple store or AASP.

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