If all you need to do is wipe the drive then download a stand alone boot image. See http://www.ultimatebootcd.com/
This bootable load comes with 9 different tools to wipe your disk.
P.S. if you do reload windows to your disk you STILL won't be able to delete running from windows. Windows prevents suicides. You need a stand alone boot to clear the disk (or you can pull the disk, attach to another computer and clear it that way)
Aside: That's a nice gaming laptop.
edit: follow USB instructions for the download to build bootable USB. Make sure your laptop's BIOS has the USB port in it's boot sequence (or use f12 on boot to get a bootmanager panel on most laptops ... I didn't check yours)