Hello srobert1939,
Welcome to the HP Support Forum.
I understand your Deskjet 2515 is having a Print Quality issue when printing from your Windows 7 computer even after changing inks and Uninstalling and Installing the software.
This HP document: Troubleshooting Print Quality Issues will guide you through the steps to resolve your printing issue.
I will check back in to see if this has resolved your problems.
Thanks,