Sometimes in Windows we get error messages like “Error Deleting File or Folder,cannot delete the folder: it is being used by some other person or program.You can get rid of this message by using a freeware software Unlocker.
Unlocker application is designed to be a very useful Windows Explorer extension allowing users with a simple right-click on a file or folder to easily get rid of error message such as error deleting file or folder, cannot delete folder.There has been a sharing violation. The source or destination file may be in use or the file is in use by another program or user. Make sure the disk is not full or write-protected and that the file is not currently in use.
Unlocker Solves all the above problems.

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After installing the program you need to right click on the file/folder you want to delete and there would be a option for unlocker click on that and then delete the file/folder.

Download Unlocker from here.