system
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I’m sorry, everyone–on further investigation, it is the entire home directory structure that is shared.
This is a Windows 7 behavior that I was not aware of (and don’t care for).
This doesn’t relate to Avast, and please feel free to close or delete this thread as you like.
I found this information at http://social.technet.microsoft.com/Forums/windows/en-US/56cbde14-79c3-4b64-b2a1-2d2141b6fed6/why-does-windows-share-the-users-directory-by-default?forum=w7itprogeneral.