If you get a message that the color scheme is using most of its allowed memory, or if you get a message that the computer's performance is slow and it's difficult to perform common actions, such as moving a window, you might want to change the color scheme from Windows Aero to Windows Vista Basic (or another color scheme) to improve performance.
If you change the color scheme from Windows Aero to another color scheme, you will no longer get the full Windows Aero experience. Windows Aero is the premium visual experience in this version of Windows. It features a transparent glass design, window animations, Windows Flip 3D, and live window previews.
Open Appearance Settings by clicking the Start button , clicking Control Panel, clicking Appearance and Personalization, clicking Personalization, and then clicking Window Color and Appearance. If the Appearance Settings dialog box is not displayed, at the bottom of the page, click Open classic appearance properties.
In the Color scheme list, click Windows Vista Basic, and then click OK.