root account expired

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http://unix.stackexchange.com – I have two accounts on my computer: james and john. james is the only administrative account and a few days ago I set it to expire out of curiosity. Now am stuck. I can not login using james because it has expired, I can not use john for anything because it is not a member of sudoers. I can not login as root probably because root and james shared a password. Kindly help. (HowTos)