Error with Front Page

I have my blog site at http://www.agniveer.com. No matter what I do, I am suddenly unable to change my front page. I had installed AZIndex and generated a site index page. Now my blog has automatically made it the default front page. Even when I have deleted the index page and also the plugin, I still get a 404 error that the site index page was not found.

Kindly guide how to I make changes to my site so that I can choose the front page as per my wish.

Thanks a lot
Sanjeev