WinSAT is used to determine the systems ability to turn on Aero Glass. The reassessment using WinSAT can be done by one of the following methods:

• Refresh the performance rating from Performance Rating and Tools in the Control Panel.
• From a command line with administrative privileges, type: winsat dwm.

Clean Boot Windows Vista

Performing a clean boot in Windows Vista is very much similar to Windows XP. The steps on how to perform a clean boot are outlined in the following Microsoft Knowledge Base article: How to perform a clean boot in Windows XP (310353)

Disable Aero Glass

To disable the Aero Glass interface, follow these steps:

1. From the Start menu, click Control Panel.

2. In the Control Panel window, click Appearance and Personalization.

3. In the Appearance and Personalization window, under Personalization, click Customize colors.

4. In the Windows Color and Appearance window, click Open classic appearance properties.

5. In the Appearance Settings dialog box, choose a color scheme other than Windows Vista Aero.

The Window Vista Aero scheme can be displayed three different ways:

• Transparent Glass
• Opaque Glass
• No Composition

Here are the steps to determining the Aero interface mode:

1. Open a window in a restore view (non-maximized).

2. Observe the top right corner of the window where the minimize, maximize and close buttons are located.

3. Refer to the images below for a comparison:

   Aero Interface mode	Composition
   Glass Transparent	Yes
   Glass Opaque	Yes
   Vista Basic	No

   Install or Update a WDDM Driver

   The Aero Glass interface requires the use of WDDM drivers for your video hardware. Contact the manufacturer of your video card for information about how to download and install the most recent drivers.

   Note: This information provided by Microsoft.