Do you have error messages?, like :
Path too long
Error cannot delete file: cannot read from source file or disk
Cannot delete file: Access is denied
The source or destination file may be in use.
The file is in use by another program or user.
Error Copying File or Folder.
I often get such problems while working on my PC and it annoys me cause it wastes my time as well. When my friend told me about long path tool to get rid off such type errors. It works smoothly and doesnt effect efficiency of my PC. You can try it.
For your help I am giving you a link to download it freely. http://longpathtool.com/