hello I tried to share folders and files in window vista but when I'm going to access the shared folders it asks me alwayz the password how could I resolve this in order to access it automaticaly without asking username and password.thx

This you have enabled password protected file sharing, have a look on this simple file sharing in Windows Vista (no password required) article to help you.

I don't know why you would want to lower your security. If you have a wireless router & someone connects from the outside, they will have access to your shares. How do you know when a politician is lying? His mouth is moving.