Install ap won't accept admin password

When we try to install Yosemite, the installer won't accept our admin password
(blank).  We tried changing the password and
System Preferences > Users & Groups > Change Password
wont accept it either.  What do we do?

Two options:
1) Create a new Admin account and give it a password. Use that to install.
2) You could try the Password Reset Utility in Recovery. Doing so will not change your keychain password, so you'll have to change that, too. I would change the login keychain password first, then use Password Reset Utility to change account password to the same password. I have not tried this, so I don't know if it will be effective at recovering the keychain post password reset.
Password Reset:
Boot into Recovery
Open Terminal from Utilities menu.
Type resetpassword and hit return.
Follow prompts to select Hard drive and user account.
Reset the password.
Restart normally.

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