The installation software for your J6480 printer can found at the below site,
http://welcome.hp.com/country/us/en/welcome-copy.html#Support
On step 1, at the site, click on the circle that indicates " download drivers and software ".
At step 2, enter " J6480 " in the product search box and click the " go " button ".
After clicking the " go " button, you will be taken to a page where you select your operating system.
Select your computer's operating system and click " next ".
The software, that is available for your system, will appear below.
Select the appropriate software needed for your use, download to your computer and install..