On a Windows XP-based or Windows Vista-based computer that has Windows SteadyState installed, all user accounts may be disabled, or the computer may restart repeatedly.

Consider the following scenario:

• You connect an external monitor to a portable computer that is running Windows Vista.
• You disable the portable computer’s built-in display.
• The portable computer turns off the external monitor because of the lack of user activity.
• You disconnect the external monitor, and then you resume the portable computer.
• The portable computer’s built-in display turns on.
• You reconnect the external monitor.

In this scenario, the external monitor displays a black screen.

Consider the following scenario:

• You have Windows Vista Home Basic installed on the computer. Or, you have a similar version of Windows Vista installed on the computer.
• Then, you install Windows Vista Service Pack 1 (SP1) on the computer.
• Then, you try to upgrade to a version of Windows Vista that has additional features. For example, you try to upgrade to Windows Vista Ultimate.
• To perform the upgrade, you use Windows Vista media that does not contain the updates that are included in Windows Vista Service Pack 1.

In this scenario, you receive the following error message:

The upgrade cannot be started.

Then, you receive the following error message:

To upgrade, cancel the installation and then choose to upgrade to a version of windows that is more recent than the version you are currently running.

Note: This issue may also occur when you use the Windows Anytime Upgrade feature to upgrade Windows Vista.

The information in this article applies to the following configuration(s):

• Catalyst Display Driver 7.2
• Radeon® X800 GT
• Windows Vista 32-bit Edition
• Windows Vista 64-bit Edition

Symptoms:
When using a Radeon X800 GT graphics card in Windows Vista, the Aero Glass theme is unavailable.

When you try to install Windows Vista, you cannot select the Upgrade option. Additionally, you receive the following error message in the Install Windows dialog box:

Upgrade has been disabled

- Windows cannot determine if another operating system exists on your computer. Try repairing the boot configuration, and then begin the installation again.

When you try to upgrade a computer to Windows Vista, you cannot select the Upgrade option. Also, you receive the following error message in the Install Windows dialog box:

Upgrade has been disabled
- The upgrade cannot be started because the content on your installation disk is written in a different language than the language on your computer. To fix this, get an installation disk that uses the same language as your computer.

When you try to install Windows Vista, you cannot select the Upgrade option in the Install Windows dialog box. Additionally, you receive the following error message in the Install Windows dialog box:

Upgrade has been disabled
- To upgrade, start the installation from Windows

When you try to install Windows Vista, you cannot select the upgrade option. You receive the following message in the Install Windows dialog box:

Upgrade has been disabled

This message is followed by additional information that describes why the upgrade option has been disabled.