Allowing Network Access with Blank Passwords with Vista

Although you can log in locally without a password, by default, Vista does not allow network users to access the computer without a password.
To change this setting:
1.Run gpedit.msc
2.Go to Computer Configuration / Windows Settings / Security Settings / Local Policies / Security Options
3.Double click on Accounts: Limit local account use of blank passwords to console login only
4.Disable this option