If you run the command to disable PPW, you will also disable other XP
functions associated with image files, so I don't think you want to do this.
You can do several things.
1. Use Open with as I recommended before
2. Change the association for editing from PPW to the software you want.
John Inzer will give you the instructions on how to do this.
3. Open the software you want to print with and then open the file you want
to print.
You do not tell us the software that your friend is using for printing, so
we don't quite know how to respond. Do you have the same software? With some
photo editing software, you can, during installation, specify this software
to be your image viewer and editor instead of PPW without disabling the PPW
capability if you ever want it.
If you do not have software to edit and print, you can download and install
the free software from here:
www.faststone.org
Then open Faststone and open your image in it and print any size you want.
Finally, there is another possibility depending on the scanner you have.
Instead of saving the file you can direct the output of your scanner to your
printer.