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After you click Switch User, you may not be able to see your user account. Because of this, you may not be able to log on to your computer. This symptom can occur if:
You have more user accounts than can be displayed at one time.
You cannot see a scroll bar that you might use to view more of the user accounts.
This problem occurs if you are using the Windows Classic style for windows and buttons.
To work around this problem, use one of the following methods:
Use the TAB key to highlight the user at the top of the list, and then use the UP ARROW or DOWN ARROW keys on your keyboard.
Click any user account, and then use the wheel button on your mouse to browse through the list of user accounts.
Use the Windows XP style for windows and buttons:
Click Start, click Control Panel, and then double-click Display.
Click the Appearance tab, and then click Windows XP style in the Windows and buttons box.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
If you have more user accounts than can be displayed on the Welcome screen, a scroll bar appears when you log on so that you can scroll through the list of users. This scroll bar is not available on the Welcome screen with Fast User Switching.
Fast User Switching is a feature of Windows XP that makes it possible for multiple users to use a computer without having to quit all running programs and log off before the other users log on.For additional information about Fast User Switching, click the article number below to view the article in the Microsoft Knowledge Base:
279765 HOW TO: Use the Fast User Switching Feature in Windows XP