1. Open User Accounts applet in Control Panel.
2. Click on "Change the way users log on or off" link as shown in following screenshot:
3. It'll show a new page containing 2 options:
Use the Welcome screen
Use Fast User Switching
Now if you want to disable new Welcome screen and XP style dialog boxes, then disable both options. Or if you want to enable welcome screen and new XP style dialog boxes, then enable both options.
NOTE: You might get following error message while enabling "Use Fast User Switching" option:
Fast User Switching cannot be used because Offline Files is currently enabled. To make changes to Offline Files, click OK.
If you get this error message, click on OK button and it'll show a new dialog box. Now disable "Enable offline files" option in this dialog box and click on OK button. Now you'll be able to enable "Use Fast User Switching" option.
http://www.askvg.com/how-to-enable-disable-new-xp-.....indows-xp/
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