format my laptop

You can make a Bootable USB Pendrive with some type of software that can format the hard drive... The software can be a Partition Manager or the Hiren's Boot USB. The GParted page has links with full instructions and the Hiren's page also has instructions to create a bootable USB pendrive with Hiren's Boot USB which has several applications that can format a hard drive.

GParted Live on USB
http://gparted.org/liveusb.php#windows-setup

GParted Live Manual
http://gparted.org/display-doc.php?name=gparted-live-manual

How to make a Bootable USB Pendrive
http://goo.gl/Ga2cOj

Bootable USB Software
http://goo.gl/pytU0W

Hiren's BootCD From USB Flash Drive (USB Pen Drive)
http://www.hiren.info/pages/bootcd-on-usb-disk