I have searched my computer for a /etc/launchd.conf file but I cannot find it.
That would be Mac only.... Anyway, start by trashing the prefs in the prefs folder:
Beyond that you might consider reinstalling Adobe Reader/ Acrobat. Some of these errors are caused by damaged shared PDf components. if the machine has a specific printer installed, remove it (temporarily) and uninstall its driver. This may also help, if files have stored printer information. Likewise, check your system's color settings and color profile usage. "Bad" profiles can have all sorts of negative influence...