Hello there, Jim Luftman.
QuickBooks 2012 is no longer supported in Windows 10. To verify this detail, I'd recommend looking it online. With that said, you might need to upgrade to a higher and supported versions of QuickBooks Point of Sale so it will be compatible with your Windows operating system. You can download it here: Download QuickBooks Desktop Point of Sale.
After that, you can already install the downloaded program: Install QuickBooks Desktop Point of Sale.
Meanwhile, I'd recommend contacting the HP Support Team about the drivers that are compatible with Window 10. They can give you links or steps on how to download it.
Here's an article related to the hardware drivers for QuickBooks Desktop Point of Sale: Install compatible hardware drivers for QuickBooks Desktop Point of Sale.
We'll be right here if you need anything else.