1. Open run and type cmd.
2. Change to the directory where your folder is located. cd
3. cacls /e /p everyone:n
4. Now noone, including you can not open or delete that folder/directory.
5. To remove the restrictions, again follow from step 1 and 2.
6. cacls /e /p everyone:f
7. Thats it. Now you can protect your folders from unauthorised access.
Now you can save your files from getting deleted by any one . so enjoy this trick