[b]I found many files that are no use, just taking space. How can I delete these items or files permanant??

As this is in the Recuva discussion forum, are you talking about Recuva finding a lot of deleted files? If so then the space they are taking up is freely available to any user or application on your pc. You cannot remove them in any sense of the word. Even if you did more would appear as soon as you touched your pc. The majority of these files will eventually be overwritten: personally I wouldn't worry about it.