I recently switched Macbooks with a family member and are both experiencing similar problems due to deleting the original administrator on the computer. I am having difficulty installing new software, error messages pop up. And she is having problems opening up applications such as iTunes and iPhoto (saying to make sure the application is compatible with that version of Mac OSX, there is no reason it wouldn't be it worked right before deleting the original administrator). This leads me to believe there is an issue with deleting that original administrator does anyone have any solutions or ideas on how to remedy this issue? I'd really appreciate it.