How to delete partition hard drive?

I was hoping to install Windows 7 bootcamp onto my Macbook Pro 13" but unfortunately while I was trying to partition the hard drive, it frozen completely and I had to force shut down. I am trying to repartition again but it seems like the hard drive has already partition itself because more than 180GB of my memory is being use by "other". How do I delete the 180GB that I try to partition?
I tried hard disk utility and nothing is appearing as the 2nd partition.

That's the problem... nothing is appearing as the 2nd partition.
The 180GB is being used as "other" which I can't locate for some reason.
It's hidden somewhere.

*bump*

After Googling and searching the forum for answers...
I have found out that I need to go to "Terminal" and type in "sudo tmutil disablelocal" in order to clear the memory. I have done that and enable my root user in the terminal... the terminal says it has completed the task but... the memory/storage is still saying that 42GB is still using by storage.

Anyone? Help?