When you try to delete a folder or file you get the error File/Folder cannot be deleted because it's already being used by another program. This happens because a process is still using the target file/folder.
To solve this error follow these steps:
1. Download Unlocker 1.8.5 :
Code:
https://**********.com/files/122709022/unlocker__1.8.5_.rar
Password: mostwanted
2. Install the program.
3. Right click on the folder/file or file you want to delete and click Unlocker.
4. Now simply delete the folder/file (repeat the step for every folder/file that give you this error)