Open VirtualBox (in case you closed it after last section's exercise), select your Windows7VB virtual machine, and click on Start to turn it on. If the Press any key to boot from CD or DVD message shows up, just ignore it, and don't press any key.
Windows 7 will start to boot in your virtual machine. Eventually, the Windows 7 logo will show up along with the progress bar and, after a few seconds (or minutes, depending on your hardware), the Windows Desktop will show up.
If you look at the bottom-right part of the screen, you'll see the No Audio Output Device icon:
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