You will need to boot into Safe Mode and log on with the built-in System
Administrator account.
Start the PC and when it begins to initialize, start tapping the F8 key
continuously until you see a menu. Use the arrow keys to select the Safe
Mode option and press the Enter key.
Select the Administrator account and press the Enter key.
When XP starts, go to Control Panel/User Accounts, select the account you
normally log on with and select the "Change the password" option.
Well, you can set up a password for the default Administrator account. But
realistically, if someone has physical access to your computer, there is no
way that you could keep them out.
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