Magento Admin Login not working on WAMP localhost

If you install Magento on localhost WAMP you cannot login to admin section due to cookie valiting the domain, since localhost is not a valid domain you must:

Go to app/code/core/Mage/Core/Model/Session/Abstract/Varien.php go to line 85 and find the code:// session cookie params

$cookieParams = array(
‘lifetime’ => $cookie->getLifetime(),
‘path’ => $cookie->getPath(),
‘domain’ => $cookie->getConfigDomain(),
‘secure’ => $cookie->isSecure(),
‘httponly’ => $cookie->getHttponly()
);

comment the last three array elements as here:

// session cookie params

$cookieParams = array(
‘lifetime’ => $cookie->getLifetime(),
‘path’ => $cookie->getPath(),
//’domain’ => $cookie->getConfigDomain(),
//’secure’ => $cookie->isSecure(),
//’httponly’ => $cookie->getHttponly()
);