Restoring a new mac

I just bought a Mac from someone that was 5 days old. I want to restore it so that I can start fresh. I inserted the disc, restarted and held C. It gave me the option to install Mac OSX and now it's doing it... but it didn't say anything about wiping the hard drive clean and restoring to factory settings. The guy that sold it to me said that I wanted to choose the option to completely restore and not keep any of the old data.

So did I do something wrong? It says it will take 50 minutes to install OSX... am I just going to have to wait it out and start over?

Wait until finished then see what the set-up is.

If the old data is still there try installing again, and choose the erase and install option

Installing OS X 10.5 Leopard - Choosing Leopard Installation Options

Yeah I just read the manual like I should have done to begin with. It mentions that I want to use the utility to erase the hard drive and then install the OS. Sorry for the premature post but thanks for the response. I guess I have to play the waiting game.

This post may be a bit late, but there's not really any need to erase the drive, especially on one that's only five days old. Just erase his user account (if he still has one on the Mac, that is) and you should be fine. This isn't Windows where your computer will get bogged down by all kinds of junk from normal use. Just plug it in and enjoy!