Problem in networking sharing

Hello,

my pcs are connected with each other through peer to peer networking, i have installed a local printer with one pc, then i have connected that printer with other computer also, when i connect that printer first time through network its work properly, but if i restart pc and then try to give print command its does not connect, but again when i tried to connect again that printer through network its ask for login and password for other computer, when i entered login and password then it connect properly, but again when i will restart the printout will not come,

second question when i am connecting a pc though network it ask for login and password everytime, can i remove this option, i requried two option
1. first time login its should ask for login and password
2. never ask for login and password

kindly send my suggesation

regards

ravi