Fdisk USB (Fdisk Boot)
The fdisk USB utility can be run from a USB flash drive. To do this you will need to create 
a bootable USB flash drive. This can be accomplished using the HP flash drive tool that you can find on the Internet using a Google search: HP bootable flash drive tool. Once you have created a bootable flash drive you can install DOS and the DOS utilities along with fdisk. This bootable flash drive makes a great technician tool to be able to retrieve NTFS files on Windows XP drives.
Fdisk NTFS (Fdisk Utility)
You can add free utilities to your bootable DOS flash drive, such as, Active NTFS Reader for DOS, for reading NTFS files from DOS and retrieving important data from non-functioning Windows operating systems. I also have a YouTube videos that goes into this subject in more depth.
Fdisk CD
You can also create a bootable DOS CD to use fdisk again on a non-function Windows operating system. Nero and some other CD burning programs allow you to create bootable CDs using DOS startup files. This provides you another nice tool for accessing a computer that will not boot.
How to Fdisk
Fdisk can be a little challenging when you first attempt using it. It does not have a friendly user interface. I have also created an Fdisk DOS tutorial YouTube Video that you might find helpful.
GParted Partitioning Utility
Gparted is a free Open Source utility that you might find helpful. GParted has a friendly user interface and operates very quickly for creating partitions and even resizing partitions without destroying your data. I also have a GParted tutorial video you might find helpful.
Fdisk MBR
The Fdisk MBR website has many other articles on this subject you might find helpful along with Fdisk USB.