'Page Not Found' error on all pages of Drupal website

I got page not error on all pages of a drupal website.

I solved this by running update.php

Soetimes this fixed navigation only. Clean urls will not work.
I found that .htaccess was corrupted. I transfered it again. It worked.
Finally I enabled clean URLS from my admin panel.

Setting cron job in drupal

Goto cpanel select cronjobs , you can see standard/advanced option.
Add this 'curl --silent --compressed http://yourdomain.com/cron.php'