The computer has Windows XP Home Operating System.
I cannot get to the desktop.  I do not have a System Repair Disk.
How can I get into the computer to Format the Hard Disk Drive?

   Since evidently you do not have an operating system on your computer that works, you need to get a CD/DVD that has an operating system on it and start your computer with it.
   We have a program called XP Recovery CD Maker which will make a boot CD with an operating system on it but it will only do so if you have a working XP computer with a i386 folder and the proper files in it (some Windows XP computer have such a folder and some do not).
   Or you can buy a boot CD on the internet.