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02 Mar 2012  

Windows 7 Home Premium 32bit SP1
VirtualBox - "Some audio devices (PCM_in) could not be opened"

I'm trying to use VirtualBox however whenever I start any virtual machines I am presented with this message:
"Some audio devices (PCM_in) could not be opened. Guest applications generating audio output or depending on audio input may hang."

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This happens regardless of which guest operating system is installed or even if there is no guest OS.

What does this message mean? How can I stop it from appearing?

Thanks in advance!

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