If you are having trouble registering with the correct username and password, here are a few ideas. If you used google chrome to install magento, use firefox to open magento and edit the app/code/core/Mage/Core/Model/Session/Abstract/Varien.php in your magento directory and comment on those lines below.
$cookieParams = array( 'lifetime' => $cookie->getLifetime(), 'path' => $cookie->getPath() // 'domain' => $cookie->getConfigDomain(), // 'secure' => $cookie->isSecure(), // 'httponly' => $cookie->getHttponly() );
And use your login credentials. I hope this works for you.
Deepak lamichhane
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