When you click the Index button in Windows XP Help and Support Center, the Index page may be completely empty, with a placeholder icon showing up in the top left corner.
Additionally, when you click the Related Topics link in a Help and Support Center article, the pop-up may not be displayed. Each time when you click the Related Topics link, the "Notes" icon may multiply as seen in Fig 2.
This happens if the Microsoft HTML Help control is blocked (probably by a Microsoft Update) by setting a "Kill bit" in the registry. To fix the problem, upgrade to Service Pack 3 which issues an updated version of hhctrl.ocx control.
If that does not help, run the following command from Start, Run dialog:
(as of Windows XP SP3)
MS05-001 Vulnerability in HTML Help Could Allow Code Execution
MS05-026 Vulnerability in HTML Help Could Allow Remote Code Execution
MS06-046 Vulnerability in HTML Help Could Allow Remote Code Execution
MS07-008 Vulnerability in HTML Help Could Allow Remote Code Execution
Help and Support link from Start Menu does not work
Error "Your current security settings prohibit running ActiveX controls on this page" in Help and Support