I just don't understand

How is it that I have two printers hooked up to this computer and I've printed on vellum on each of them and, yet, tonight I can't get EITHER of them to print a simple Word document on vellum? I'm well-educated and have worked with computers nearly all my life. I print documents on a daily basis using Word. But tonight, two reasonably intelligent adults have spent the better part of two and half hours trying to print a simple paragraph and still have nothing to show for it. I am beyond frustrated.