Hi.
There is no support or driver available for this scanner. The scanner is SCSI and does not need a driver in order to work.Nikon never manufactured or distributed Windows drivers, they discontinued distribution of manual and old controlling software.
Here the minimal support page.To have the scanner working in XP you need to install ASPI driver, then manually install drivers using file NkScnXP.inf, held in hidden folder INF/LS2000/WinXP.
Pretty much the same with Win 7, you may have to use compatibility mode with 7.
You will still need a SCSI card to connect the Centronic 50 Pin cable to scanner and to manage the scanner. This kind of devices may give a lot of headaches with newer systems.
To install files, refer to the discussion below.
Windows XP Nikon Coolscan III