Password Portecting my PC?

Hello, my operating System is Windows XP Professional version 2002. How do I put a password lock on this thing?

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Thank you.

go into ur accounts, start/settings/control panel/accounts

put a password on ur account, but if i reboot ur machine in safe mode and log in as Admin 9if u dont have account deleted or password protected to) i could delte ur password and have total control of ur PC