I am having problem with my vista. The problem is i have one pc with windows xp professional edition and i did the sharing file and printer as well. Then i used my laptop with xp professional, i can access the file without any problem. I have another laptop with windows vista and i try to access to PC but it required the username and passsword? Before this happened, my laptop with windows vista can access the PC xp professional. Then recent 2-3 days, when access the PC windows xp professional, it required password. Anyone can help me?