FDUSB drives are made for Mac only. These won't work on a Windows machine.
If your drive is FDUSB-xx or FDUSB-xx2, this is the correct driver for Windows 98/98SE. Note: FDUSB-M sounds like perhaps it's for mac. If this is the case, it won't work in Windows.
Windows ME/2000/XP machines do not require any driver for usb floppy drives. Those os's support these drives natively.