Can I convert a SCSI device (scanner) to USB?

I have a Nikon LS 2000 scanner I would like to use with a laptop running XP

You can buy adaptors from SCSI to USB. They retail for about $40 AUD, so about $32.25 American. You can probably find them at your local computer store.
or a scsi pcmcia/mini card - free up the usb ports :D