Virtual PC fenetre absente

If this happens to you - there are three possible solutions:

Exit Virtual PC and delete %appdata%\Microsoft\Virtual PC\Options.xml. You will lose any global configuration settings - but you will get the console back on the next launch.
Follow these directions to edit Options.xml, and change the values for the left_position and top_position fields to something smaller.
Immediately after opening Virtual PC (and before clicking on anything) press ALT, Left Arrow, Down Arrow, m, Left Arrow – and then move your mouse. The console should snap back onto the screen.

Cheers,
Ben

ou
There are several ways to resolve this issue. Among them:
Browse to %appdata%\Microsoft\Virtual PC\
Backup the "Options.xml" file and load the original in a text-editing application
Under the "console" section, remove the entries for "left_position" and "top_position"
After saving the changes, load Virtual PC