To unlock pasword - Dell Latitude D600 Notebook

Hello,
If you forget your Windows password or if your password expires, you must reset your password before you can log on to your computer. This article contains two methods that you can try to reset your password so that you can log on to your computer again. These steps only work if you have previously created a password reset disk for the computer, or if you can log on as an administrator to assign a new password to your account.

If you do not have a reset disk or cannot log on as an administrator, unfortunately, you may have to reinstall Windows XP and all other programs that were installed on the computer before you can use the computer again. This is for security. Without these safeguards, anyone could reset a password to anyone else's computer and gain access to private information.
In XP their are two ways to change the password.
1st method - Restart the system and when you see the computer manufacturer's name Dell or HP or any other start tapping the F8 button 5 to 8 times. A menu will come. Choose the safe mode option and then press enter on the next screen on selection of the os. Your computer will now show u a new account by the name of administrator. If you had an admin password then u won't be able to get in here either. But most people dont have this so log in to this account and go to the control panel and you will be able to remove the password for your own account. Restart system and you are good to go.