Create a new folder on your hard drive: c:\dj840 before downloading the printer driver.
Download the driver to the newly created c:\dj840 folder.
Open the c:\dj840 folder and double-click on the downloaded "exe" file. Once the files are loaded and the "hp deskjet 840c" screen displays, proceed to step 6. If this screen does not display, continue with the next step to manually open the screen.
Double-click on the c:\dj840\Win_NT folder to open the 3 letter language folder. For example, the English driver will display an "enu" folder.