bap, i am not sure, it told me that something like "the new user set up process is not compatible" and then it created the Admin user with a blank password. I then deleted all the ".kext file that starts with "GeForce" or "Ge" or "NV" or "NVD" " and rebooted, then the res was back to normal. i will not be able to offer more than that, i hope that some one else might be able to.