// blog not loading //

Hi,
I have a big problem, my blog is no longer loading suddenly, I have installed a plugin (popup scheduler) after I activated it and created a popup I tried checking my blog and it takes me to the WordPress First time installation page, to write a blog name and put in my email, like the very first time I have installed my blog.

Why did that happen? This blog has been on for 2 years, is everything gone? How can restore the blog?

Help, please, cheers!