Создание локальных пользователей

/// 

/// method to create a new local Windows user account
/// 
/// Username of the new account/// Password of the new account/// Account display name/// Account description/// Value of whether the new user can change their password/// Value determining if the password ever expirespublic static bool CreateLocalWindowsAccount(string username, string password, string displayName, string description, bool canChangePwd, bool pwdExpires)
{
    try
    {
        PrincipalContext context = new PrincipalContext(ContextType.Machine);
        UserPrincipal user = new UserPrincipal(context);
        user.SetPassword(password);
        user.DisplayName = displayName;
        user.Name = username;
        user.Description = description;
        user.UserCannotChangePassword = canChangePwd;
        user.PasswordNeverExpires = pwdExpires;
        user.Save();

        //now add user to "Users" group so it displays in Control Panel
        GroupPrincipal group = GroupPrincipal.FindByIdentity(context, "Users");
        group.Members.Add(user);
        group.Save();

        return true;
    }
    catch (Exception ex)
    {
        MessageBox.Show("Error creating account: {0}", ex.Message);
        return false;
    }    
}

Взято с http://www.dreamincode.net