Unable to log you on because of an account restriction

My computer has 1 account and 1 Administrator account. Neither have ever had passwords and when windows xp pro was on it went directly to the desktop. I ran a registry fix on the comp and the system rebooted. When it was finished it came up with a logon screen for the account wanting a password. Pushed enter and won't work without a password. Also tried to logon to safe mode and use administrator but it wants a password there also. I used a "Offline NT Password & Registry Editor, Bootdisk / CD" and rebooted. It showed that my Administrator and account had a dis/lock which I corrected and then rebooted. No passwords were showing on either. After the reboot it comes with the above message. If I Control Alt Delete, I can't go in that way either.
Can anyone help me please. I have been trying for 3 days to fix this. I did a system restore point prior to running the registry fix but can't get in to restore. I don't know what else to do.:cry

 

I have exactly the same problem right now. I have 3 regular accounts. Previously NONE of them required a password. Suddenly they ALL do and so does the Administrator account in Safe Mode. I think this is some sort of new virus or something.

I would appreciate it if anyone here on the Geek board had some ideas.

 

lcw2...sorry-to-ask,-but-what-registry-fix-brand-did-you-use?