as experience, some old printers no longer support in windows 7, my last company also using a printer the one that is DotMatrix with Windows 2000, when we upgrade to windows xp, it run but dili na mao ang design, we even tried to edit the software for the payroll for the design but dili gyud siya, so we went back to windows2000, so make sure the printer has driver for windows 7 if not go back gyud mo sa old os which the system runned.