How to securely restore new MacBook air after someone else was first admin user I've just received my new MacBook Air. (my first Apple computer in 15 years!) Unfortunately, I had it sent to work on a day I wasn't in, and it was mistaken for the new intern's computer. He proceeded to do whatever it is one does with a new mac when one first receives it.

I have the admin password he created, but I imagine I need to do a full wipe to be sure the computer hasn't been tampered with - i.e., a login script exists that maliciously exports my data.

What steps should I take to secure my laptop? What registration etc. information might I need to correct that one enters upon starting up a new MacBook Air?
The simple way is to boot to recovery mode and use disk utility to first erase the "Macintosh HD" partition, then start the installer. No need to zero the drive since you won't be recovering any deleted files at this point. 

A verified correct installer of Lion will then get downloaded from the Internet. 

Here is a guide for you...


OSX Recovery
OS X Lion: About Lion Recovery


Once you go through the new boot process to create your preferred admin account and register the Mac to your Apple ID. Just send in whatever registration info you please when prompted.  This will bump any prior registration if it was even sent.