how to delete partitions bootcamp

So,

I attempted to use BootCamp to section a part of my hard drive to run Windows 7 (64Bit). When running, BootCamp appeared to have crashed or something, leaving a good half of my hard drive unusable. I have been on DiskUtility but the Erase button is unclickable. I have attached two pictures. The one from the About This Mac menu used to have the empty BootCamp partition but I somehow deleted that, it is still on the DiskUtility and is still a partition. I'm really confused on what is going on and any help would be really appreciated.