can't delete or reformat ''freespace'' partition in disk utility (Bootcamp)

hey guys, im stuck... i was trying to instal windows from USB with bootcamp but during the setup of windows it didn't understand the format it wanted NTFS, although bootcamp did the format so I presume it was formatted as exFat. so in the windows setup I formatted the partition as NTFS.
but then again, it didn't work, so i went back to osx and formatted it with the Tuxtura NTFS plugin... that was a mistake because a message showed up that the format was failed because it didn't support Core Storage... so i tried to reformatted or delete the partition but it didn't let me in disk utility... so i went back to the windows setup and deleted it from there... that ''worked''
I then went back to osx again to see if i could do anything with the partition again. it now shows up as ''free space'' but when I try to format it, it just keeps hanging... when i try to shut down disk utility it says: Operations still in progress... i waited for a couple of hours, but nothing seems to happen. it now stays as freespace...
i tried a full restore with time machine, but it didn't delete the partition. im lost

 

Hey thanks for your reply, i already tried to format it with disk utility... maybe i should do it in recovery again.. and delete the whole disk, instead of just restoring it with time machine... although i don't look forward to that, the last time i restored from time machine. my itunes library was half empty