Model: HP Photosmart 7550 printer, Version: 4.2
Operating System: Windows 95 (Note: might work with other versions of this os.)
Download and Installation Instructions:
1)Download file to your hard drive.
2)Go to the file and double-click it. Choose "unzip."
3)With the printer disconnected from the system, select "Install hp photosmart printer series software" and follow the onscreen instructions.