Thanks to everyone who offered ideas. I have to work out a problem with the equipment here since there is nothing wrong with the document.
My computer does not automatically select the correct settings for documents, and for example, it always selects letter size as the default paper size, which I have to change to A4 every time I want to print something. When I change from portrait [default] to landscape, it automatically alters it back.
The printer [HP Laser Jet IIP plus] is much older than the computer but is a reliable old workhorse. There is a compatible driver on the computer for the printer, which I use.
It is an Adobe document, and I have Adobe reader, but thanks for that idea too KSF.