Changes to log in options must be made as a user with admin rights...How did you "add" the limited user? From the Control Panel/User Accounts?
Although one of the accounts has a name as "adminstrator", are you sure of what your other account name is? For example, it may be "Owner"..
Did your other two adminstrator accounts have passwords?
You mention that you can log in after restarting the computer..How do you log in? Is there a log in box listed and if so, you should be able to type in the word "administrator", then the password, if any, then press the "Enter" key. If there is no password for the two adminstrator accounts, then simply press the "Enter" key after typing your user name.
To verify which user accounts are still viable and what names they use, click on Start-Run, type: CONTROL userpasswords, then click on OK. The current users will be listed and if you can gain access as a user with admin rights, you can change all permissions from that location.
Here's a link on how to restart in "Safe Mode":
How To Start In 'Safe Mode'
Hope this helps.
With Windows XP Pro. I added a limited user account so I could be safer. Now I cannot open either of the administrator accounts -- there is no Welcome screen -- and when I log off and restart comp, only have choice to log in as limited user! Tried to get XP to start in safe mode, apparently I'm pressing f8 at the wrong time? I am so befuddled... can anyone tell me how to get back to my administrator accounts and then make sure the Welcome Screen appears and fast switch is an option?