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

do these steps :
1: go through: xampp\htdocs\magento\app\code\core\Mage\Core\Model\Session\Abstract\
2: open Varien.php file
3: make comment line number from 87 to 104 save it and try to login...