Download the SCSI Driver for your server from the hardware manufacturer’s site (Dell/HP/?) and burn it on your Floopy Disc /CD.
When doing fresh installation of Windows 2000 or any other OS, it will ask to ‘press F6 to install third party RAID or SCSI Drivers’ during the initial file loading. Press F6 then and put in your SCSI Driver floopy disc in the floopy drive (if you have burnt the drivers on to a CD, you will need to take out the installation CD and put the driver CD in the CDROM, wait for the program to ask you the location of your third party drivers and do it then). The setup will install the SCSI driver and then you can proceed with your regular windows installation.