Blog gone

Hello,

My Blog is listed on xxx.com/wp_ar and I go to xxx.com to have an acess. but today I don’t know I guess I deleted something maybe the .htaccess file ? and when I go to xxx.com I cannot see the blog I can see the actual files in the root.

when i go to xxx.com/wp_ar the blog says page not found (I can see everything in the blog, header, side, footer..).

I can access to the Admin page but what can i do now ? to get my blog back to xxx.com ?

Please help