i am in TROUBLE Pls Hlp Me

Local cable operator provided me internet connection..like my cafe there are so many other cafe of my area using same internet network. so what happen customer of other cafe access my printer and give printout on my printer.

previously i had windows ME and HP Printer..so in that i did sharing with passwrod.

but currently i installed windows XP for better performance. and I share printer on network and there is no password option.

in my cafe there is no server and all pc directly connected to hub.

so how can i give sharing password to my printer in windows XP pro.