How to check if AERO is enabled in Windows Vista

Windows Vista usually automatically enables the AERO graphics engine on Home Premium versions and higher.
But some systems might not have the video card or system to handle it ,to check if it´s enabled do the following:
Right-Click on any empty space on the desktop and choose the Personalise option.
In the Personalise window choose the Window Color and Appearance option ,in the new window make sure that Enable Transparency is checked ,if it is AERO is enabled and working.
If you would like to disable the whole AERO thing then you can also do it in this window just click on the option at the bottom that says Open classic appearance properties for more color options and choose Vista Basic theme.