There have been several reports of this today and the common thread is all use CCleaner software. It updated recently to ver. 5.31.6104 and it had problems. I just heard from one user that Piriform, I guess the software creator, knows there is a problem and issued fix.

So how do I get my files back. I have Piriform ..I need to help in locating and retrieving my files

Several users refer to restoring from their backups…

There is a discussion over at CCleaner of all their happy customers about fixing the mess they made. I suggest you visit that forum.