PRE8  Some MPEG's dont play sound?

I have created 50 mpg files. Three of them dont have sound when played on my Vista HP [Media Player 11] and WIN7 HP [Media player 12] machines, but all play fine on my WIN-XP Dell [Media player 11]. On my Samsung netbook [Win 7 starter] they didnt play at all. After loading some codec, I now get picture, but no sound. My conclusion is that these 3 files of 50 are some how flawed, but the XP version or it's Codec are more forgiving. Another point is if I import these flawed? MPG's back into PRE8, the audio tracks look good and play in Premiere. When I make a new MPG using the bad files, then I get a new MPG that plays everywhere.
So, what went wrong with these 3 files? They were created on the Vista box, which has only one 500GB drive and 3GB ram.
I really dont like to do the same thing and get different results. Most important: How do I prevent errors like this?

My sources are DVDs, from which I had only the VOB files. Some of the problem DVDs had a brief message about indexing and conforming audio. These DVDs were made by my son-in-law on some machine that made DVDs from tapes played on his camcorders. I would normally use the original or an AVI copy of it. The analog tape data is now only available from the VOB files.  Some of the later digital data, I can go back and get from the tapes. My real worry is about ongoing problems. I have had no problems with the AVIs, but the are 4 times the size. I had thought to end up with mpgs on files that I never plan to edit again.  My longer goal is to put copies on removeable drives like 1TB WD passport, which I can put in the safety depoist box.
In terms of being sure that these files can be played, does Adobe have download for codec that work with the files PRE8 generates? 
I have just upgraded from PSE 8 to CS5 and am thinking to buy a new box. I am not a big video user, but am upgrading my Nikon D80 to a D90, which can take HD vid.  I am thinking I will get an Intel I7, Win7-64. I think I can afford 8-12GB ram. I guess for the video , should think about at least two HDs. Is a stand alone NVIDIA needed for Photoshop, or mainly for the video?  That seems to bump up the size of the power supply.
This is tough on an old guy, so any help would be great.

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