Having problems erasing and reinstalling Mac os x on 2007 MBP 15in

Hello
I am having some problems here and was hoping for some help.
Just recently here, I decided to erase and reinstall Mac Os X on my sister's 2007 MBP. She just recently got a new 15in MBP and wanted most of her content on the 2007 to be erased. Well... I did some reading around and found that the easiest way to do so was with the os X DVD that came with the thing. Problem is....I can't seem to find it for the 2007 MBP. So I decided to try the 2010 version. Went into the disk, ran disk utility, wiping the hard drive, did all the right steps according to Apple, and then rebooted to try get a clean version of OS X on. Well, problem is, it would come to the language select screen, but after that selection, it would come up with this error:
"Mac OS X can't be installed on this computer
If you want to restore your system from a Time Machine backup, click "Restore from Backup"
I've tried reformatting the HD several times and even tried restoring, but it wouldn't display my system restores...
So my quesiton is, is it becuase I have the wrong DVD that its not working or is there something else I"m missing?
Any help would be vastly appreacited (especially since its not my computer!)
Thanks!
Jordon Spronk

The install disks that come with a model of a Mac have certain hardware drivers for the computer and video card, you can't use another Mac's install disk.
However you can use the $29 Snow Leopard install disk, but it doesn't come with iLife, that's extra.

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