Running Windows 7 Professional SP-1 32-bit. I've been away from the computer for a week, and nobody else uses it. Now, the "Format" option has disappeared from the context menu on all drives with removable storage -- both internal and external. Otherwise, the drives work normally, including the other context menu commands. Hard discs still have "Format" in their context menu. Running SFC /scannow did not fix this. Please advise.