Here are the processes for 123.HP.Com/Setup for windows.

You should begin by navigating to the 123.HP.Com/Setup webpage.
After that, you will be prompted to input the model number for your printer.
In addition to this, you will need to select the Download option from the menu.
The next step is to double-click the file that was downloaded earlier.
Further, you should follow the directions that appear on the screen.
At this point, the last step is to print a test page.