HOW TO HIDE ALL DRIVES IN COMPUTER

Hide all drives in my computer
Click on RUN then type REGEDIT and then
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
create a new DWORD value as NoDrives and modify its data to 03FFFFFF(six F's)
reboot and you are done.
To change back delete the key or modify the data to 0. (zero)