After 2 weeks of working just fine, today my Virtual PC 2007 console started to play games with me, it appeared minimized in my taskbar or in the system tray, but no interface, no maximize option in the context menu (when the console was minimized).

I had to google this problem and the solution is very simple. In the %appdata%\Microsoft\Virtual PC folder, the Options.xml configuration file has to be modified.

The content in my case of the relevant section was:

<console>
   <height type="integer">246</height>
   <left_position type="integer">4294935296</left_position>
   <top_position type="integer">4294935296</top_position>
   <visible type="boolean">true</visible>
   <width type="integer">359</width>
  </console>

After changing the values everything work just fine:

<console>
   <height type="integer">246</height>
   <left_position type="integer">10</left_position>
   <top_position type="integer">10</top_position>
   <visible type="boolean">true</visible>
   <width type="integer">359</width>
  </console>