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#11
If it were my computer, I would back up what I want to save and start with a fresh install, completely wiping the SSD before installing Windows. When you get to the first Windows setup screen (after booting from a Windows installation USB flash drive or DVD), press Shift + F10 to open a command prompt. Run:
diskpart
list disk
select disk # <- replace the # with the actual disk number of the SSD you are going to install Windows on
clean <- this will completely erase the disk selected above, make sure it was the right one!
exit
exit
Then when you get to the choice, select the custom install option, on the next screen highlight the unallocated space on the drive you want to install to and click next to let Windows set it up.