Generally due to a virus attack, sometimes some pages under Display Properties are no longer available.
Run Regedit and search for
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System\
Remove keys, if they are present
NoDispAppearancePage
NoDispBackgroundPage
NoDispScrSavPage
NoDispSettingsPage
Now the Display Properties should be OK.
If, also the Task Manager is grayed out, there is a chance to find this key too
DisableTaskMgr
that must be removed.
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