Ha, the problem is Windows itself!!!
Better stay by your Macs if you don't want to get angry!!!

Okay, the problem with your DVDs seems to be that you will need the right decoder for your DVD type. Look at the suffix of your DVD files and search the web for those decoders. You will find some freeware and the one or another will be working good for you...

If this wiil help you then, please, tell me so!
If this won't help you then, please, tell me not!

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Greetings from Frankfurt (Germany),
Sheriff ;-)