Why can't I Clean Install?

Hi Guys,
Hoping you can shed some light on my dilemma. I'm currently trying to do a clean install of MAC OSX on my Macbook Pro. Simply, I've gathered up so much junk over the last year and a half that my machine is struggling to run. Normally, I would just delete files etc - however the files are so dispersed over the computer that this would take me weeks.
- I've attempted the reboot with the Mac Install DVD. I hold down C at the mac chime, and get to the screen via the dvd. However, I'm then informed that MAC OS X cannot be installed on this computer.
How come? Considering it's already running MAC OSX 10.5.5??
Thanks,
Glenn

Welcome to Apple Discussions!
Mac OS X does not itself have a "clean install". The suggestion to zero your hard drive is excessive. A simple erase should do, but I'd only do this if other options of cleaning your hard drive are not successful*:
http://www.macmaps.com/diskfull.html
and repairing the directory*:
http://www.macmaps.com/directoryfaq.html
See what install options Mac OS X does have here:
http://discussions.apple.com/thread.jspa?messageID=607614
- * Links to my pages may give me compensation.

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Date: Thu, 2 Dec 2010 12:47:12 -0700
From: [email protected]
To: [email protected]
Subject: Why can't I re-install CS4?
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>

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