Hi ulamusic,
I understand you have a Photosmart C5550 that you're wanting to use with a Windows PC. I'd be happy to direct you to the proper drivers :)
If you click here you can access the drivers page for your printer. There isn't full feature software available for Windows 8.1, so if you have an operating system that doesn't have full feature drivers, please let me know which version of Windows you have and I will provide instructions on how to install the in operating system driver for your printer.
Hope this helps, have a great day!!