well u can get them back however depending on your hard drive will depend on how long this will take, then once its done you will have to go through thousands of files to get what you want, It depends on how imporant they were
when u delete a file it doesnt actually delete the file, it only deletes the path to the file and then this space is marked free, ready to be rewritten by other data, if the data hasnt been rewritten the data recovery rate increases
i recommend
Recuva by Piriform
Use a deep scan, , location > C:/ and the type All files
My 500gb took 10 hours + i think n my pc aint slow
0-120 GB may take a hour or 2 i would say