Goto run.Type regedit.Now go to:HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\ExplorerNow in the right pane create a new DWORD item and name it 'NoDrives'. 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. 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.