Mac OSX can't be installed on this computer

I have a Macbook (circa mid-2007).  It's running Leopard and I want to do a clean install of ANY OS that is more current.  Unfortunately, any other OS I try will not install.  I tried Mountain Lion (since I had recently upgraded my iMac) and that didn't work.  Then I found a disk for 10.6.3 that my son had from when he got his Macbook before he left for college.  I got the same error message that it couldn't be installed.  I had tried the 10.6.8 that came with my iMac but that didn't work.What the heck is going on? According to the specs for this machine (2 ghz Intel Core 2 Duo, 2 GB 667 mhz DDR2 SDRAM) these upgrades should work (except maybe the one for the iMac). 

The DVDs which come with Macs contain a Mac OS X version which is only compatible with the computer they came with, so you can't use them to install Mac OS X on the computer you have now.
You have to buy Mac OS X Snow Leopard from the Apple Online Store > http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard Then, the installation is simple: insert the DVD, start your Mac holding the C key while your computer is starting and install Snow Leopard. Also, you can install it without starting from this disc

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