Unable to reinstall Mac OSX

Hi, I recently bought a preowned Macbook. I want to reinstall the operating system but when I put in the "Mac OSX Install Disc 1" and rebooting it, it said "This software cannot be installed on this computer."
Why is this? How can I get past this?
Thanks

Hi
Check that the disks are for the Macbook as grey discs are machine-specific. The seller should've given you the discs with the computer.
I presume this is an Intel machine? If so, the black DVD (silver X) won't work on it either as it is PowerPC. This message normally means you've got the wrong kind of disc.
If you have trouble locating the seller, you could try contacting Apple & explaining the situation to them. They may be willing to send you the right discs (you will probably have to supply Macbook's serial number so they give you right ones), though there will be a charge for that.
Steve
In this thread, person has similar problem:
http://discussions.apple.com/thread.jspa?threadID=957131&tstart=0

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