I changed my laptop from a domain to WORKGROUP and rebooted as directed. Now I cannot log in to XP. I tried every username/password combination I have ever had. At the login screen, when selecting the Options tab, it used to ask if I was logging onto the network or this computer. That option is gone.
Restore? Re-add it to the domain. You used to have a domain account, when you are off the domain, that account does not work. You need a local account to logon now. Contact whoever setup the laptop, they should be able to get you on.