[support] Drupal 4.7.2

Hi I have installed drupal-4.7.2.tar.gz and created mysql username and password also in the MySQL Database Server. I am able to see the main page while I hit http://example.com/index.php The Issue i am facing is when i click on any of the links on the main page, it redirects to index.html only. For Example When I hit Create new account located on the left side of the main web page it redirects to index.html, the same is for rest of the links also. Am I missing something here,I know I am missing something but could not figure it out what I am missing Thanks in Advance Kaushal