right click, open with, choose program, choose Windows media player, check the always use this program for this type of file.
Otherwise, fire up windows media player, click the tools tab, click options, then click the file types tab, make sure the DVD video box is checked
I don't know how to change the file settings on Real Player.
You could also turn the Auto Play thing off. Then whenever you put a disc in, you'll have to start it up manually. Meaning it'll stop it from loading up in Real player right away.
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