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Hi there and welcome
Yes he should be able to watch the DVD if it is a single Layer DVD
Download this free program
It is a very good DVD player
Once installed, put the DVD in and it should play within it
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please.