Windows 8 how can i make sure to make files unrecoverable?

[skeptic]

hi
at windows 8 i deleted some files and moved to recycled bin. after that I made recycled bin empty
but as I heard there still are ways to recover deleted files.
which program can I use to wipe the deleted data without option to recover it? i know revo uninstaller is good for programs installs and other setups maybe, but specified files how can I get rid of them permanently without formatting pc?
cheers

 

[patcooke]

Download ccleaner (free version). It has an option to wipe the free space on your drive. If you want to permanently delete a file with it being recovered you can use something like fle shredder to delete it instead of using the recycle bin - download here for free: http://www.fileshredder.org/