Note that under WindowsXP, if you try to install the 4-in-1 drivers over the native WinXP drivers, the 4-in1 installs only the 1.40a.inf file. However, if you right-click the setup.exe file, choose properties, then in the Compatibility mode tab, check 'Run this program in compatibility mode for: Windows 2000", then click Apply and OK, you will be presented with all the driver install choices when you double-click setup.exe.