Files remain on the C drive after deletion

After a deep scan with Recuva I found old files from several years ago. I tried to overwrite (Delete) them and although the right hand column said the files were overwritten and un recoverable, they are still there. Otherwise this is a fantastic product. How can I truly delete the problem files? Any help out there? I even used C Cleaner afterwards but the problem files are still there after the next Recover run.

i think this here

b88756-1431113404.jpg

check the drive you want

here an free tool:

[competing product link removed by moderation]

or this little portable tool with drag and drop function:

http://www.softwareok.de/?Download=SicherLoeschen

there are certainly a number of other tools ...

i think this here

b88756-1431113404.jpg

check the drive you want

I'm trying this and will let you know if it works. Thanks