I'm gonna upgrade my leopard Macbook to Snow Leopard and Windows 7. However, I plan on doing a clean install of Snow Leopard (lost Leopard dvd) and install bootcamp Windows 7 after. Can I do that? Put in a 500gb hdd, install Snow Leopard fresh, bootcamp it, and put in the Snow Leopard dvd (I no longer have the Leopard dvd). Is that process okay?