[help] Desktop tab at Display properties

My Desktop tab (which is on Display properties window) disapear...

Can anybody help me to turn it back?

PS

i have put this records in registry (as a first atempt to repair)

[HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem]
"NoDispBackgroundPage"=dword:00000000
"NoDispScrSavPage"=dword:00000000
"NoDispAppearancePage"=dword:00000000
"NoDispCPL"=dword:00000000

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