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Sony Vegas playback problem!

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I've just finally found a free trial of sony vegas I haven't used and it was working perfect and everything was playing back fine, but then it stopped letting me playback projects, a message pops up saying:

"An error occured while starting playback" The device specified is in use.

And when I click on details it says,"The playback device Microsoft Sound Mapper does not exist".

Anyone know the problem?