To install the TWAIN drivers, you shold have: 1) The device driver for your scanner installed. 2) A TWAIN.DLL file. 3) The file with the DS extension. Following are the steps needed to install the drivers. 1) Install the device driver that came with your Scanplus scanner as indicated in the manual. Make sure that your driver is dated after December 15, 1992. Here is the list of the drivers: SCANDEVC.SYS <--- Driver for Color Scanners SCANDEVG.SYS <--- For gray Scanners SCANDEVB.SYS <--- Driver for Pagereader 300. 2) Make a subdirectory called TWAIN under your windows directory. 3) Copy the SCANPLUS.DS file to the C:\WINDOWS\TWAIN directory. 4) Copy the TWAIN.DLL file to the C:\WINDOWS directory. >>> ZSoft users <<< If you are using any ZSoft software, you need to load their driver also. Their driver name is HPSCANER.EXE. Our driver, SCANDEVC.SYS must be loaded before HPSCANER.EXE. Zsoft automatically installs the HP driver named SJII.SYS. You do not need to install this driver to use our scanners. SCANDEVC.SYS must be loaded instead. You also need to set the contrast control switch in the SCANDEVC.SYS to zero when using Zsoft software. Your line in your CONFIG.SYS file should look as follows: device=c:\SCANDEVC.SYS /C0 The previous line sets the color mapping to zero (0). Color scanning needs color mapping to enhance viewing.