Create Undeletable folder

WARNING: I do not take any responsibility about anything.

Tested on WindowsXP, Vista, Windows7. √

1. Right-Click an empty place on your desktop.
   
2. New > Folder
   
3. Hold (ALT KEY) and Type 2 5 5 then release (ALT KEY)
   
4. Click anywhere.

You made your own undeletable folder.