video using recuva stops playing halfway

So this is what happened

I updated to windows 10

- after the update i notice ALL my files were gone, i go into panic and search google

- some guys said the files are in the window.old folders

- so i go there , i think i didnt find it there BUT i did think i find them in os©-users-myname

- i then begin to cut and paste everything but my pictures to the NEW documents, videos, downloads folders

- so after all of that i begin to use like normal and shut down my laptop

- i then reopen my laptop to find my old wallpaper is back, a message from windows saying my old files are back etc

- i then go to my files and realize EVERYTHING was gone except for the files i DID NOT cut and paste

- i then download recuva, go back to windows 8 and success, my files are there after i use recuva and i recover them, most of them work fully, though some dont , and some videos stop playing after halfway

was wondering why it doesnt work fully and how to fix this, thanks