Quick help! Partitions in the Ubuntu installer

[DehraX]

So I figured out that I would install Ubuntu on my laptop. I've gotten this far. The problem is that I have 2 partitions, one containing my current Windows 8, the other containing Windows 7.

The problem is that I want to keep the WIndows 7 partition (For warranty reasons), and I just can't figure out how to just format the WIndows 8 partition... The checkboxes won't work :/

[DehraX]

Solved it! I just deleted the Windows 8 partition and created a new one+swap space.

[Goku]

Thats what I was going to recommend, but I didn't want to mess anything up. I never really have dealt with partitions or installing Ubuntu is all.