When it asks you where to put the Copy of Windows, it also gives you some options for Formatting. I think, if you select the partition you are after, the one you previously tried to install Windows on, if you press D it will delete that partition, it could be another letter, the options are at the bottom of the screen. Then you press C, go with the Automatic Filling options and finish off. It will say the Partition is Raw, then click to Install Windows on it.
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.