check
Navigate to
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
If there is a DWoRD Value such "NoDispScrSavPage" with a data value of 1 this will disable the screen saver tab. Change the value to 0 or delete it to
see the tab again.
olso uninstall the display adapter and reinstall it
check if youre signed in as an administrator on xp