If you have 64-bit Microsoft Windows 7, make sure you’re installing the correct version of the driver for your printer. Microsoft Windows is available in two platform versions: 32-bit and 64-bit. These platform versions refer to the architecture of the machine or the computer itself. If the application supports 32-bit operating system, you can install it on both 32-bit and 64-bit Microsoft Windows.
But if the application supports 64-bit operating system, you need to install it on a 64-bit Microsoft Windows only. But since you are installing a driver or the software for your printer, the driver has to be specific. Since you have 64-bit Windows 7, download DCP-7065DN Software Package for 64-bit Windows 7. This should install your printer properly on your computer.
To get the most functionality out of your printer, click on the “Full Driver & Software Package” link under “Full Driver & Software Package” section to download the complete software package for your printer. Check the rest of the page for other useful utilities like the “Firmware Update Tool” which allows your printer’s firmware to be updated.