Help! Data loss

I have no idea what official files are...but here's what I would do if I were you:

First thing to do is look in your Recycle Bin (or Wastebasket) on your computer. When you find what files are in your Recycle Bin, do a restore of the files and you should be all set.

However, if they're not in your Recycle Bin, go to a computer repair facility and hire them to perform data recovery. Give the bill to your friend because it is their fault you incurred this debt.

And if they're not in the recycle bin, be very careful you don't over write those valuable files.

There are many software available online for data recovery but most probably I use Recuva for recovery but it’s paid version.