Patrick explains, I am repeatedly prompted to enter my admin password when I am installing OS X(
but I do not use a password. I just leave it blank. How do I get past this and get OS X installed?” How
should you respond?

A.
Enter ‘apple’ for the password during installation. You will be prompted to change your password
when installation is complete.”

B.
“You can create a Standard user account on the machine, set a password, and install OS X while
logged in with that user account”

C.
The OS X Installer will not accept a blank administrator password. You will need to change the
password for that administrator account in the Users & Groups pane of System Preferences before
you try to install OS X.”

D.
“You may use your Apple ID password instead of the administrator password when prompted.”

Explanation:

http://www.postseek.com/meta/a8ff6677e03e3cda6576bc771fe53013