Then first you install windows then you can install Linux. In this method only you can install these two OS. Because Linux support both windows boot loader and Linux. But windows support only windows boot loader it does not support Linux boot loader. Which Os you install last these OS occupy the boot laoder. As per my first method if you first you install the window then install Linux in these way Linux support both boot loader so there is no problem. But if you install like that Linux first windows second then window does not support Linux boot partition so windows it boot only windows.
