Hi,My hosting provider identify that security attack is made on these files below and until the file is not clean, you will not be able to see your website online
I deleted these file, now how can i retrieve my website
Can you redownload your version of Magento 1.X from the Release Archives tab of this page? https://magento.com/tech-resources/download. Then you can copy the missing files into place.
In general, I would recommend using a version control system like git so you can restore files should they have been modified or lost.