That should work o.k., but you don't actually need to create the NTFS from gparted. Simply deleting (all) the partition(s) should suffice.
The Windoze installer checks if there is a partition it knows about (NTFS or [V]FAT) or enough free space. If not (i.e. all the partitions are Linux), it quietly exits. Looks like it never booted, but if you watch it carefully it actually does.