I tried this. There were only two Registry entries. I had installed drivers through Windows so I could use the printer. I was hoping to re-install the HP Solution Center so I can scan documents to PDF again.
I created the administrator account as suggested, ran sfc, which found no issues, then ran the installer again.
Same result. That path wasn't found.
I'll reinstall Windows. The installer works on a Windows 7 laptop, so I'm assuming this will solve the problem. But it will be a pain to do.