As during the previous installations and tests I was noticing a considerable flickering in the screen when switching on the TV and switching from full screen TV to boxed TV I decided to deactive all Windows Vista graphical interface features (Aero and the like). You can easily do this by right clicking on Computer in windows file explorer (Windows Explorer can be easily called up by pressing the windows logo key together with the 'e' key), and selecting properties. This will bring up the following window:

After selecting Advanced System Settings in the top left menu, the following dialog appears:

Clicking the Settings... button in the Performance section reveals the place to change the settings we are looking for:

As you can see from the picture above, I selected the Adjust for best performance option. This effectively disables all Windows Vista's window manager advanced graphics features, and boosts the DirectX performance in Media Portal.