Hi
go to the setting panel and pick the printer icon. when the window is open, there is at the bottom on the left hand side where the printers are listed, a + and - (read plus and minus sign) select the printer and click on the minus sign, to remove the printer, keep doing this till they are all gone. disconnect the printer, restart your mac - connect your printer, install any drivers if needed.
And I am on a PC :-) so doing this from memory
Henrik