Wow. I must be an idiot. I never knew that you could log in as Administrator on Windows XP Home.
To do so, when you come the Windows Home Login Screen (the one with a button for each user, and when you click the button, it gives you a password field) simply press Ctrl-Alt-Delete twice (or so), and you will get the standard login screen with a username and password field. For username put the username, for password put the Administrator password, and you are logged in as Administrator. On some computers, if you don't specify a password, it just leaves it as blank. Amazing.