Consider the following scenario:

• You enable the Windows Aero color scheme on a computer that runs Windows Vista.
• You enable the Auto-hide the taskbar option.
• You configure system display to use multiple monitors, and then you later you switch the system display back to a single monitor.
• You move the mouse pointer into the taskbar area.

In this scenario, only the Start button appears. The rest of the taskbar is invisible.

Consider the following scenario. You have an application that has several owned WS_EX_APPWINDOW pop-up windows. Then, a user selects an inactive window in this application from the taskbar of a computer that is running Windows Server 2008 or Windows Vista. In this scenario, the currently active pop-up window is selected again.

For example, assume that an application has a main window and the owned pop-up windows C, D, and E. Pop-up window D is active. You click the button on the taskbar for pop-up window C or E to make that window active. Instead, pop-up window D remains the active window.

When you start Windows Vista, you receive the following error message:

Activate Windows Now
Your activation period has expired and Windows is no longer working.
To use Windows you must activate this copy of Windows.

Additionally, the taskbar does not appear. You have limited access to Windows Vista programs and to Windows Vista features.

In some scenarios, the Network Discovery and File Sharing dialog box may be unexpectedly minimized to the taskbar in Windows Vista. The Network Discovery and File Sharing dialog box may contain prompts that affect how files and folders are shared on the computer.

For example, the Network Discovery and File Sharing dialog box may be waiting for an answer to a prompt. However, you may not notice the prompt immediately because it is minimized. Therefore, you may unnecessarily wait for the prompt because the dialog box is minimized. In some scenarios, a sharing progress bar may appear on the screen. However, the progress bar never finishes.

This problem may occur if one of the following conditions is true:

• While the computer is connected to a network, you turned off Network Discovery and File Sharing.
• You tried to share a file or a folder.

When you start Microsoft Windows Vista, you may receive the following error message:

Activate Windows Now
Your activation period has expired and Windows is no longer working.
To use Windows you must activate this copy of Windows.

Additionally, the taskbar does not appear. You have limited access to Windows Vista programs and features.