If you are running Windows XP Home Edition, you must start the computer in safe mode, and then log on with an account that has administrative rights in order to access the Security tab. Access to the Security tab is required in order to change security permission. If you are running Windows XP Professional, you do not have to start the computer in safe mode. For more information about how to start Windows XP in safe mode, click the following article number to view the article in the Microsoft Knowledge Base: