Magento can't login in admin with right username and password

Question

I just freshly installed Magento(1.7.0.2) on my localhost(LAMP). Now after installation when I wanted to go for the admin panel it asked me for the username and

Answer 1

     If you are suffering to get logged in with the correct username and password. replace the code with the New code 

    Original code:-
    $cookieParams = array(
                'lifetime' => $cookie->getLifetime(),
                'path'     => $cookie->getPath(),
                'domain'   => $cookie->getConfigDomain(),
                'secure'   => $cookie->isSecure(),
                 'httponly' => $cookie->getHttponly()
            );

    New Code:-
     $cookieParams = array(
                'lifetime' => $cookie->getLifetime(),
                'path'     => $cookie->getPath()
    /*,
                'domain'   => $cookie->getConfigDomain(),
                'secure'   => $cookie->isSecure(),
                 'httponly' => $cookie->getHttponly() */
            );
File Path :-app/code/core/Mage/Core/Model/Session/Abstract/Varien.php