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Why WinXP Fast User Switching doesn't work Insufficient memory For Fast User Switching to work properly, Windows XP must have at least 64 MB of RAM. Although this is a defined minimum, Microsoft states that the system must have at least 120 MB of free RAM or XP will deactivate Fast User Switching. This can especially be a problem if the system shares video memory with main memory. In addition, for Fast User Switching to work properly, the currently logged on user may have to exit a few programs. Third party programs Third-party programs, such as the Novell client and the Citrix client, replace the Microsoft Graphical Identification and Authentication file (Msgina.dll). Fast User Switching requires Windows XP's original Msgina.dll file. Check third-party applications to see if they replace this file. Incompatible applications Even though Fast User Switching is supposed to allow one user to keep applications running while another borrows the computer, some applications aren't compatible with this feature. You can use the Windows Application Compatibility Toolkit.
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