HOW TO make undeletable Folder

1. Press windows key and r (start-run)
2. type 'cmd' for command prompt
3. select your drive (eg: d:) and press enter
4. type 'md con\' and press enter

Now You have created the undeleteable folder !

How to delete it?
1. Press windows key and r (start-run)
2. type 'cmd' for command prompt
3. select your drive (eg: d:) and press enter
4. type 'rd con\' and press enter

now your folder will be delete .... !