[bryanthompson]

when you say that the quality is poor when switching to your wife's printer, do you mean that it does the exact same thing (with the strikethrough)?

Try unplugging the printer, System preferences -> print & fax, remove your printer, then plug it back in. It should find itself and come back. Don't know for sure if that will fix your problem, hopefully it does.

I couldn't imagine any kid being able to change some setting that would cause such a problem... Apple tries to hide everything that could cause problems. It sounds more likely to be a broken printer than a wrong setting... although switching printers should have been able to verify that.