If Control Panel>Performance Information and Tools is
broken, try this. In the registry editor, navigate to the following two
keys (both keys may not be present, but you probably have one or the other):
HKEY_CURRENT_USER \ SOFTWARE \ Policies \ Microsoft \ Windows \ Control
Panel \ Performance Control Panel
In the right-hand pane, delete the value named PerfcplEnabled (if found).
-And/Or-
HKEY_LOCAL_MACHINE \ SOFTWARE \ Policies \ Microsoft \ Windows \ Control
Panel \ Performance Control Panel
In the right-hand pane, delete the value named PerfcplEnabled (if found).
These values may have been entered by a tweaking program, or by a group
policy setting.