windows XP "switch user" not working

I have to completely logoff each user in order for anther user to sign on........the switch user task does not work........the boxes are checked in the control panel--user accounts-- to use the switch user function and to use the welcome screen but I still doesn't work.......it did work until I had to reinstall windows xp----Dell guided me in doing this and now they want to charge me to fix the problem......do you have any suggestions as to what I can do??? thank you, Margie




thanks Miz, have already done this ...have edited the above the reflect this for others......any other suggestions???

 

From Microsoft Knowledge Base article 279765:

To enable Fast User Switching, you must also enable the "Use the Welcome screen" option. This feature cannot be used if your computer is a member of a domain.
To enable Fast User Switching:
1. Log on to the computer as an administrator.
2. Click Start, click Control Panel, and then click User Accounts.
3. Click "Change the way users log on or off. "
4. If it is not already selected, click to select the "Use the Welcome screen" check box.

NOTE: The Use Fast User Switching check box is unavailable until you click to select the Use the Welcome screen check box.
Click to select the Use Fast User Switching check box, and then click Apply Options. Quit the User Accounts tool.