Two recent Apple KB articles of note: 106605: Mac OS X 10.1: Do Not Reinstall After Using the Mac OS X Update 10.1.1 states: "You should not reinstall Mac OS X 10.1 ...
Q: I am a customer of Comcast/Xfinity. Recently, I changed my old modem/router for a new modem/router and everything connected without issue except for my printer, which is an Epson Workforce 645.