This printer and all from this series are compatible with Windows 7 which means that the bundled drivers from this operating systems are available for your product. This is the official statement from HP Support Website:
"The drivers for your HP product are already included in the new Windows 7 operating system! You do not need to download drivers to use the product . Simply connect the printer to your computer with a USB cable, and Windows Update automatically installs the driver for your product."
Please use Windows Update while your printer is connected and powered and let it download all the necessary drivers and software.