Windows Aero is the flagship user interface theme that ships with most versions of Microsoft Windows Vista operating system. Aero is an acronym that stands for Authentic, Energetic, Reflective and Open. Aero features visual enhancements such as translucent window borders and several unique 3D graphics effects right on the Windows desktop.
If you're interested in learning more about Aero, you may want to view the Microsoft site here for a quick primer on its main features. Wikipedia also has a good summary of Windows Aero.
If you'd like to enable or troubleshoot Aero, please choose one of the following options: