Once you get to the part where you can chose the partition like you shown in the photo you posted ealier, press SHIFT and F10. this will bring up CMD. Next up type in "diskpart" followed by "list disk". This will show all the drives connected to the pc and will give each one a number. next up type in "select disk x" (change "x" to the number of the drive that you want to format) and then type in "clean". Next type in "convert mbr" once youve done that close the cmd window, press refresh on the list that shows partitions and hopefully this time windows installation wont complain.