Set password for win7 and printer in LAN but printer sharing

Question

I login win7 with the "administrator" account and password: xxx, my computer is the server to share the printer to other computers on the LAN, if I change the password of the "Administrator" account then the computer Other computers on the LAN will not print. If I create a "PrinterShare" account and a yyy password to share the printer, when I log in to win7, there will be 2 accounts: "administrator" and "PrinterShare", I don't want to share the printer account when I log in appears, how do I do it ? or I use an "administrator" account that still shares the printer, but I am allowed to change the password as long as the computers on the LAN do not know my password when sharing the printer.