I recently installed backtrack 5 onto my hard drive using the installer program after booting from a usb. The installer program allocated 400 gb of space and now i'm out of room for windows. How do I uninstall backtrack 5 and reallocate the 400 gb to windows? I downloaded gparted onto a bootable usb but I got the error that partitioning the drive may not allow me to boot windows again. How can I undo the install?