don't have switch user button

message from =?Utf-8?B?dGFuZ2xhbmc=?= on 8 Jun 2004
I have tried before to turn "Fast User Switching on". But it won't allow me to do so...For your information, my pc is not the member of the network domain, but my pc is the member of the workgroup.

what is the solution to enable me to get back the "switch users" button?
 

Archived message: don't have switch user button (Microsoft Windows XP)