Virtual PC suddenly unable to play sounds

Hi everybody,
Just recently, when I try to start up virtual PC I get a message that says virtual PC was not able to start up the mac audio system, and is therefore unable to play sounds. Up until then, sounds had always played just fine in virtual PC, and I have no idea what could have caused the change, as I don't remember screwing with any sound/virtual pc settings, or installing any updates or anything right before this happened.
Does anybody have any ideas about how I might troubleshoot and/or fix this issue?
I'm running the most recent version of both OS X (10.4.8) and virtual PC (7.0.2).

Since VPC is not an Apple product, you'll get better response if you use a forum dedicated to Microsoft's Mac products such as <http://groups.google.com/groups/dir?sel=33607053> rather than an Apple forum that focuses on using Mac OS X.
Be sure to search the forum first in case someone has already had a similar question answered. You'll get your answer faster this way. Post your question in the forum if you don't find anything that helps you.

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