I have a Nikon 9000 scanner working on a Windows 7 Professional 64 bit PC using Nikon Scan 4.0.3.
I used the firewire card that shipped with the Nikon 9000, had to set Windows 7 to automatically update before it would install a driver for the firewire card - I had it set to download updates and let me decide, and it would not install a driver for the firewire card.
I followed the instructions on this site to get a 64 bit driver for the scanner, and installed Nikon Scan as instructed on this site. http://www.sevenforums.com/drivers/44994-g...ork-w7-x64.html
Everything now works. Good luck.