Make Undeletable, Unrenamable Folders on Windows

Make Folders that you cannot delete :- 

1. Click on Start and open Run.
2. Type "cmd" without quotes on Run.
3. In the Command Prompt Window that opens, type the name of the drive you wish to create your folder in the format : and press Enter.
   (e.g. If you wish to create the undeletable folder in D drive, type "D:" without the quotes. Note that the folder cannot be created in the root of C: drive (if C: is your system drive)).
4. Type this command- "md con\" or "md lpt1\" without the quotes and press Enter. You can choose any of the keywords given above as the name of your folder.

Now Windows will create an undeletable, unrenamable folder in the drive you entered in Step 3. However, the folder can be renamed to another keyword using Windows Explorer.

Deleting the Folder :-

Although, it is not possible to manually delete the folder, you can delete the folder by typing "rd con\" or "rd lpt1\" in Step 4 instead of "md con\" or "md lpt1\".