Make folder undeletable

Simple trick to make a folder undeletable:
Just follow the steps mentioned.
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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
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Now You have created the un-deleteable 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

Try It.. Enjoy It..