I'm trying to format my D: HDD so I can install a new image of Windows 7 onto it, but whenever I do it tells me that the drive is currently being used and asks me if I wish to continue with the format, I choose yes, of course. And after a couple seconds it says that it has failed to format, I have gone through and canceled all the process I have tried to manually delete everything in the HDD, to no prevail, and I have restarted numerous times. How can I just halt all processes and erase all the data?