1. Create a new folder. 2. Download M40xVB_WSetup.zip to the new folder. 3. Extract the contents of the archive. You can do so in WindowsXP by right-clicking the mouse on the archive and then select the option to "extract all" 4. Click setup and follow instructions to install the M401 demo app on your PC. 5. Download the most recent DLL at: http://lawsonlabs.com/Download/Manuals-Drivers/Model401/DLL/M40x.zip and place it within the application folder before running the app.