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.
1.Go to start->run.Type regedit.Now go to:
HKEY_CURRENT_USERSoftwareMicrosoftWin dowsCurrentVersionPoliciesExplorer
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...).