To enter Windows XP Safe Mode with Command Prompt, you must log on with an administrator account or an account that has administrator permissions.
On the PC displayed in the screen shot above, both my personal account, Tim, and the built-in administrator account, Administrator, have administrator privileges so either one could be used to enter Safe Mode with Command Prompt. If you're not sure if any of your personal accounts have administrator privileges, choose the Administrator account by clicking on it.
