Go to START → Run → Type "regedit" & Press Enter → A window will open. Then Press Ctrl+F, Type "norton" & Press Enter → Let the window find the registry → If found delete the registry by pressing the Delete button and confirming the delete by clicking on Yes. Then press F3 button and repeat the deleting process as described above until displayed that search item could not be found. I am sure that after this process norton will be removed from ur control panel and the you can repair the norton installation. Reinstall Windows if it doesn't help. GOOD LUCK!!! Ask me if you want to know more.