I also am wanting to reformat my hard drive to NTFS for the purpose of installing Windows 7. I can't find any explanation of partitioning on Linux that leads me to success, so I'm willing to start over, overwriting my Ubuntu 13.10, and partition from Windows if I ever have the courage to return to Linux. But I can't find a way to reformat to NTFS. Using the Windows 7 system DVD, as yancek suggested, doesn't work because the Format option is grayed out, deactivated, unresponsive to clicking; apparently it will reformat the drive if the drive is already NTFS, but not if the drive is ext3. I explored all the options on the DVD, but none of them seemed to lead to a solution.
I tried unsuccessfully to make a live CD of Gparted, but I'll spare you the details of that saga, unless it turns out that I must try again to do that.
I did manage, eventually, to get systemrescuecd-x86-3.8.1.iso onto a CD (and checked md5sum), and to boot from it. However, after the initial activity, when I was given a root prompt, I typed gparted (not sure where else to start), and was given a warning that the display could not be displayed (something like that -- I haven't the heart to shut down the computer and reboot from CD, copy what's there, restart, and pick up here again -- if it's really necessary, I will). The screenshots shown at http://www.sysresccd.org/Screenshots
did not appear, and I was left with the command prompt.
It seems like I'm almost there: If I can just know the commands for reformatting my hard drive to NTFS, if I understand correctly, I then will be able to install Windows from the system CD. I understand that there's probably more information I'll have to provide in order to get help, like the names or characteristics of my partitions. Can someone please advise?