Made a bad change to login options under user preferences, changed from "List of users" to "Name and password". I shut the computer down, now I can't login in when I turn the computer back on.  What can I do to fix this problem?

Have Migrated data from IMAC to Macbook twice.  Because I had too many admin ids under user and accounts preferences, I was trying not to delete the extras but that they wouldn't all show at login time.  Under Login Options, I clicked out  "List of Users" and clicked in "Name and password".  Can't remember whether I did anything else.  I shut down the computer and turned it back on to test the change.  I get a dark grey screen with all my admin ids in circled pictures plus one for guest, but doesn't let me do anything with any of the admin ids.  I clicked on any one and nothing happens.  IF i click on the guest circle, it gives me a message that the computer will restart with only Safari allowed.
Since I haven't been able to connect my macbook to my IMac so I can login to the macbook through the Imac, I can't get to my macbook.  There must be a way to fix this problem.  I expected to see places to enter name and password but nothing is allowed to enter.  Please help!

First thing I would do would be to boot in to Lion Recovery (Command+R on boot) and run Disk Utility, both disk and permissions repair.

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