Factory settings for MacBook Air

Hi, I have added a user in user&groups and have been strugling for few days with the settings. Since there are no data on the MacBook Air I need, I am ready to just re-install the whole laptop. The Apple helpdesk advised me to do it. But after I restared the laptop with command-R holding and re-installed Mac OS X Lion, the old desktop and my settings have come back. All I want is to be able to start all anew with the laptop with the facotry settings but I cant find a way to do it.

Hi there. Yes and now I did it again, but now with the alt key insted of ctrl-R. As per instruction of Apple staff whoem I explained the problem and who instructed me to do it. They even send me a file explaining me how to do it.
Please help :-). So how do I erase the drive and then reinstall it ? I dont understand what you mean by 'erase with the Disk Utility when booted to the recovery partition'.
Now that I have reinstalled twice, I am no any closer to my sollution. Problems with authorisations on files and folders still remain. Othe rproblem is that I put eg Word or Excel icons into the dock and after logging out and back in they are gone.
Best regards, Pavel

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