WMP 12 Plays VOB but NOT DVD

WMP 12 stopped playing DVDs. I have Win 7. It was playing DVDs, then it stopped. I have another Laptop that works fine and plays DVDs. I compared all I could but cannot seem to see any difference in configuration with K-Lite. Is there some Codec Tweak that might allow me to play DVDs again? Something must have tweaked when I installed the last iteration of K-Lite 10.8.5

Any help appreciated.

WMP12 actually does not use any codecs from the pack for playback of DVDs. It uses the Microsoft DTV-DVD audio and video decoders that are included with Windows 7. Perhaps you disabled one of those decoders?