I don't think it is possible to create an XP boot floppy,
but depending on what you are trying to do, you may be
able to make a W98 boot floppy to get to a command
prompt, or you can make a set of 6 XP start up disks.
In either case, look on the microsoft website or do a
search on google for "boot disks" or "boot floppy" - be
sure to scan any floppies you create for viruses on a
working pc before using them on another (don't want to
get infected before you even start!)