[SOLVED] Cannot log into computer-FEDORA 15

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http://forums.fedoraforum.org – I'm running Fedora 15. While in the terminal I changed the passwd. Now I can't log back into my computer. This computer had Windows, but we wiped Windows & installed Fedora 15. Is there a way for me to change the password again, so that I can log back into the computer, or will I have to re-install Fedora? I've tried CTL ALT F3 and that doesn't help Any help will be greatly appreciated... (HowTos)