ftp://ftp.adaptec.digisle.net/raid/aaa/131u2_v42032_drv_w2k.exe 
To install this device you need to install first win nt 4.0, then upgrade to
win2000 Professional. When you first reboot, press f6 to choose third party scsi
adapter drivers, and then insert a diskette with this driver. After that
continue installation and all should work fine (my system works).