Don't name your page: elitelifestylevillas.com/index.html
Name it index; save it as index; publish it as index
Then when someone goes to
http://www.elitelifestylevillas.com they will go to your index page.
Name your second page home; save it as home; publish it as home.
(Are you sure you want a page named "home'? If you have a link on other pages that says HOME, people would expect to go to your 'index' page.)
Name your third page about_us;; save it as about_us; publish it as about_us
Then the link on your index page to the About Us page would be
http://www.elitelifestylevillas.com/about_us.html
When you publish a page the "http://www.elitelifestylevillas/" and "html" is added automatically. Do not repeat the domain name when naming your pages.
But your links to those pages must show:
http://www.elitelifestylevillas.com/page_name.html
except for the links back to your index page which would read
http://www.elitelifestylevillas.com