It’s still not my notebook, but my friend's Dell Vostro Notebook 1200. It supposedly has the official version of Vista Home installed. However, my friend finds Vista inconvenient to use, so they want to install a set of XP system. But the original Vista system should not be destroyed because the laptop was provided by their company (even though this Dell laptop already has a dedicated partition with an image backup). Therefore, they want to install the XP system while keeping Vista intact. The effective solution process is as follows...