Enable Aero

Don't know why, but -continuing with the Windows 7 re-install- this time the Aero effects didn't come up automagically upon installation...

Had to enable those by hand.

On the Control Panel, type Troubleshooting on the search box, and then click on "Display Aero desktop effects".
A little window will pop and voilá, the effects are up & running...

God knows why, the Desktop Window Manager failed to start upon this installation on the Acer.