Huh? Do you mean you have a SATA drive and you need to load the drivers for SATA in order for WinXP setup to recoginze your SATA drive, but you dont have a floppy so you want to use your USB to install the SATA drivers?
If so, Ive never seen/heard of anyone getting their USB drive to be recognized by WinXP setup. Borrow a floppy, or buy one. Theyre like 4.95 a pop and you never know if youll need one for a BIOS update or something like this O__O