Hi smi5ths,
I understand that you are having an issue trying to install the software for the Photosmart C6150. I will try my best to help you resolve this issue.
I recommend downloading the HP Officejet Pro Software and Driver Removal Utility and running a Level 3 uninstall.
Then download and run the HP Printer Install Wizard for Windows to find and install the correct driver software for your printer.
I hope this information helps, let me know how it goes.
Thank you,