WordPress diverts again and again to installation page


I have installed WordPress on my website, after that I installed themes and plugins. I created some pages but suddenly WordPress moves to installation page again asking me to give username, password etc for installing wordpress. This happened two times in a row today. I am attaching a screenshot of the installation page.

I don’t know what is wrong with it. Kindly tell me what to do, help me.

Kindly have a quick read of this