Hi, Don.
You'll need to give us a better idea of just what you want to do.
Normally, you don't need a startup disk: just boot from the WinXP CD-ROM.
If you want an MS-DOS boot floppy, right-click on the icon for Drive A:,
choose format, and choose to make a boot floppy; note that this will boot
into MS-DOS, NOT into WinXP. If you want a floppy that will bypass the
"system files" usually on Drive C: and boot WinXP from wherever the "boot
folder" resides, then you'll need to create that floppy with NTLDR,
NTDETECT.COM and boot.ini on it.
If you tell us what you really want to do, we probably can help you do it.
RC