How to make a clean install?

[mike0130]

Hi, I have a 10.6.8 system but I want to make a fresh install. Have a GM disk, but while tried the usual way have a kernel panic after inserting Lion disk and while trying from Snow Leopard got the message, that lion cannot be installed on my computer.
Is there any way to make a fresh install?
Thanks

 

[Akatsuki777]

Install by this method.