While there is no guaranty that you can get them back. Deleted does mean deleted. There are a few apps/programs out there that 'may' be able to help you recover the data.
A few of the programs you could try would be... DiskDigger, MobiSaver, Android-Recovery and Tenorshare. They are all data recovery apps/programs. There are many others out there, so check around and see which you would rather try. There is also one called RECUVA, that I have heard is free, which you could try.
One important note though, most of these programs are not free. They may say they are "free" or have "Free Trials" and "Free Downloads". Yet to actually recover your data, and get your files back, you may be have to purchase the program/app. Just so you know.
NOTE: For future reference, I really would suggest backing up your data to a computer or cloud. Often. Better to spend the time doing that, rather than to be out all that stuff if the phone dies, things get deleted/erased or it gets stolen.
power down the PC, remove the hard disk and seek professional help.
If you keep using this disk then you will probably overwrite sectors that have your data.
Deleting files does not actually delete the data from the hdd. It just removes pointers to that data so it cant be found. The data sectors are only destroyed when another file is written over the sectors.
So if you immediately stop using the disk (The new recovery app may get installed over your data) you have a fair chance of recovering something.
This will cost money.
Alternately, buy a new hdd, remove the old one. install new windows OS and the recovery program on the new disk. Then mount the old disk and see what can be recovered.