Apparently you neglected to look in the "Windows XP Help and Support"
( start, then click on help and support (right off the "START button))
To create an MS-DOS startup disk
The MS-DOS startup disk you create will allow you to boot into MS-DOS.
1.. Insert a floppy disk into your computer's floppy drive.
2.. Open My Computer, and then click the floppy disk drive to select it.
3.. On the File menu, point to the name of the floppy drive, and then
click Format.
4.. Under Format options, click Create an MS-DOS startup disk.
5.. Click Start.
Important
a.. Creating an MS-DOS startup disk erases all information on the floppy
disk.
Notes
a.. To open My Computer, click Start, and then click My Computer.
b.. The MS-DOS startup disk only allows the system to boot into an MS-DOS
prompt. The disk contains no additional tools.