Sorry but i have difficulties understanding Your question.
If You want to install Snow Leopard, You need existing Leopard installation ( unless You know how to do it other way ).

You need Leopard distro ( like iAtkos ) installed on Your HD, and Snow Leopard Retail DVD to install Snow Leopard. So if I understand correctly, You need both iAtkos and Snow Leopard DVD, unless You want to run older version of Mac OS ( 10.5 Leopard ) - in that case, iAtkos will be enough.

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