Need help - Dynamic pages not rendering fine

Hi,

I recently installed Drupal 7 on Windows with Apache Web server (2.2) and PostGres DB. When I try to access the drupal site, I'm always seeing the directory listing and if I click on a specific php page, I'm able to see the HTML contents; but none of the dynamic features (search, filter, etc.) are working. I thought PHP wasn't installed fine; but if I throw in a simple PHP page with PHP functions, I'm able to get dynamic contents on the page. Is there any other configuration I need to do before I get started with my first site?

Thanks in advance for your help!

Regards,
Yogaesh