Hide all drives from My Computer

How to Hide the drives(c:,d:,e:,...etc) in Ur Computer

This is a great trick you can play on your friends. To disable the display of local or
networked drives when you click My Computer.

Go to Start -> Run.
Type regedit
Now go to: HKEY_CURRENT_USER\Software\Microsoft\Windows \CurrentVersion

\Policies\Explorer
Now in the right pane, create a new DWORD item and name it NoDrives
 (it is case sensitive).
Now modify it's value and set it to 3FFFFFF (Hexadecimal) .
Now restart your computer.
So, now when you click on My Computer, no drives will be shown(all gone...).

To enable display of drives in My Computer, simply delete this DWORD item
 that you created. Again restart your computer. You can now see all the drives again.
 Magic.......