HP Laserjet 2420 is NOT included with Windows 7! It is available through Windows Update, though. Sometimes users need help with this method. This page can help if you have access to the internet and Windows Update:http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?&objectID=c02536257#A4
If anyone knows how to get this driver to a machine that cannot access Windows Update, let us know.