Windows vista installed,can't install Mac OS XLeopard

I have a macbook and am trying to install a clean version of leopard. this macbook had vista installed on it. I have tried to do a clean install of mac leopard.The message comes up" it cannot be installed on this computer.
As far as I know there is no problem with the macbook it has a 120 gig hdd. this does not show in the startup disc options when I go into the disc utilities using the leopard disc.
can anybody help please?
thanks

Greetings,
I'd take the CD/DVDs that came with the Macbook, or a full retail version of Leopard, and place it in the drive and start the machine up holding down the C key until you see the spinning gear looking thing, then let go and let it boot up - it takes a bit of time.
Then at the first screen, after it's booted, say continue, and at the next screen you will find a Utility menu at the top. Click on that and select Disk Utility and select the hard disk - usually the first item in the left pane of Disk Utility, from there do an erase, and at that time you can partition it, or let it be all one partition and select a format HFS +, or MAC OS Extended (Journaled), and give it a name.
That will erase the drive and get rid of the Windows infection. If you want to infect your Mac with Windows, then use Boot Camp after you do a complete install of Leopard, and do all of the available updates.
That should get you going.
Good Luck - Cheers,
M.

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