What if u see nothing in when u open ur my computer system folder. It is possible by simple registry trick.
Open the registry editor.
Locate the key HKCU\Software/Microsoft\Windows\CurrentVersion\Policies\Explorer
Create a new dword value entry to this Explorer key by right clicking in right pane of the registry editor.
Name this key as NoDrives and modify its value to 3FFFFFF.
U must log Off or restart to see the changes.
When U have Disabled Drives, then there is no need to delete this key from registry as U can reach to desired drice by using run window.