OOo started.  File loaded from USB flash memory stick.  File edited, then closed
and saved, and OOo shut down - Quickstarter is running in the system tray.  The
USB Flash device cannot be safely shut down, until the quickstarter is exited. 
Presumably, this means the quickstarter has a file on the memory device open.

The Windows error message ("The device "Generic Volume" cannot be stopped right
now.  Try stopping the device again later.") is not terribly informative - so
figuring out what is going on is hard from the user's end.

If it were possible to have all files closed when the program is inactive, that
would be nice.  If it is possible to trap a signal from Windows so that you
could give a more informative error message (something like "To stop your
device, please exit from the Open Office Quickstarter." - even better if a
button in the dialogue could be set to shut the quickstarter down), that would
be a pretty good alternative.  It seems that there should at least be some
documentation of this somewhere in the OOo help system (which I could not find
using either "usb" or "unplug" in the Find and Index sections).