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Reinstall Internet Explorer and Outlook Express on Windows

Open the registry as administrator.
Depending on the version of Internet Explorer, search the appropriate registry subkey, right-click on the IsInstalled (REG_DWORD) value and then click Edit.
To reinstall Internet Explorer 6 on Windows XP, use the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed *Components\{89820200-ECBD-11cf-8B85-00AA005B4383}

To reinstall Outlook Express 6 on Windows XP, use the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{44BBA840-CC51-11CF-AAFA-00AA00B6015C}

Set the value to 0 and then click OK.
Close the Registry Editor, and then reinstall Internet Explorer 6 or Outlook Express 6.
You can also fix this error by running Windows Update:

http://v5.windowsupdate.microsoft.com/fr/default.asp