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HP Photosmart 7550 for windows 7, 64bit solution.
Here is a work around I found that works for me, better than the solution HP gave me.
Download the 7550 software and go as far as the setup will take you. When you get to the point that that tells you it won't work and if you want to delete and restart, click yes.
When you get back take these steps.
1. Go to control panel
2. Click on "Devices and Printers"
3. Click on "Add a Printer"
4. Click on "Add a Local Printer"
5. Dot the circle on "Use a local port" and find the 7550 port on the dropdown list.
6. Click next and pick HP and HP Photosmart D7500 series in the boxes
7. Click next and follow the instructions.
Hope this works for you as it did for me.