Can't remove duplicate files or folders

Dear Ratheesh. 
I closed all applications and I'm logged as administrator. Still can't remove anything and getting the error massage as quoted in my previous message above. Sincerely, Zemach.

Hello Zemach, please send us a screenshot of the issue that you face for better understanding and to assist you further.

Using AVG PC TUNE-UP, Trying to remove any duplicate, a pop-up says: Make sure the disk is not full or write protected and not in use. How can I remove protection and duplicates ??  My OS is W XP.
Sincerely, Z Eisenstein.

Dear Ratheesh. 
I closed all applications and I'm logged as administrator. Still can't remove anything and getting the error massage as quoted in my previous message above. Sincerely, Zemach.

Hello Zemach, please send us a screenshot of the issue that you face for better understanding and to assist you further.