Making a bootable pen drive..

Right, I have a twinmoss III Pendrive thingy (256mb), Im running Windows XP and the apllication software doesnt come with floppy disk emulation or anything. In DOS, it thinks its B Floppy drive, in windows it thinks its another harddisk. Does anyone know anyway to make it bootable?
Oh, format /s doesnt work either, it says "if ya wanna mkae a system boot disk (or somthing like that) goto add remove programs in windows ect...