Microsoft KB Archive/331841

= PRB: Fast User Switching May Be Unavailable on Systems That Use Shared Video Memory =

Article ID: 331841

Article Last Modified on 12/5/2003

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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This article was previously published under Q331841



SYMPTOMS
Fast User Switching is not available.



CAUSE
Fast User Switching is not enabled if the available RAM is less than 120 megabytes (MB).

Systems that have Shared Video Memory (where a portion of the system's RAM is used for video display memory) may reserve 8 MB or more for use as video RAM. If the system has a total of 128 MB of RAM installed, the total available RAM may be 120 MB or less after video memory is reserved. This will cause Fast User Switching to be disabled.



RESOLUTION
Install additional RAM in the computer.

More than 64 MB is required to enable Fast User Switching. The actual amount must be at least 120 MB of free RAM, otherwise, Fast User Switching will be disabled. For additional information about this topic, click the following article number to view the article in the Microsoft Knowledge Base:

294739 A Discussion About the Availability of the Fast User Switching Feature



STATUS
This behavior is by design.

Keywords: kbuidesign kbmemory kbprb kboem KB331841

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