How do I get XP off my computer without using the XP disk. I've tried booting from the XP disk and selecting the option to repair a previous installation. However, to do this it wants the administrator password for that installation and doesn't like the password i give it. I reset the admin password to make sure i knew what it was, and it still won't accept it saying it's an invalid password. Anyway, I can't get past this password step to format the computer. Is there any other way to just format it.