Your version of Windows 7 rules out using Group Policy Editor.
Does your Registry contain this entry?
HKLM\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\POLICIES\EXPLORER
HIDESCAHEALTH=DWORD:00000001
You can access the Registry by selecting Start, Run, type regedit and press the ENTER key. Do not try modifying the registry. All we want to know at this time is whether this bit "HIDESCAHEALTH=DWORD:00000001" is there?