Windows 7: WMC burned dvds won't play on dvd player

Up until 2 weeks ago I had Windows Vista. Media Center worked great and I have tons of dvds I have done. I decided to do another one today, burned normally and popped it into my dvd player on my tv and it read disk error. That seemed odd but after 3 more tries with the same results I decided to take a movie I had previously burned while using Vista and make another copy. Burns normally, but yet this one won't play either.



Now, the older copy played fine.

Same batch of dvds as the older copy, from the same package. What could be causing this? I did notice that this happened when I went to my mother's with the external hard drive and tried it there months ago. Hers would not play on her dvd player either, but mine would. Same files, same dvds, same everything except from Vista to 7.

Please Help.

Does it play on your PC DVD player?

Yes, it works on the PC and another DVD player but not the other one. Same files, same batch of dvds, different operating system.