I've just upgraded XP to Win7 Enterprise (via Vista). In Windows Update Control Panel applet, it says that updates are only enabled for Windows and provides a hyperlink to enable it for other products.
When I click either it, or directly run iexplore http://update.microsoft.com/microsoftupdate as per https://support.microsoft.com/en-us/help/901037/how-to-enable-and-to-disable-microsoft-update , it redirects me to http://www.update.microsoft.com/windowsupdate/v6/thanks.aspx?thankspage=5 which tells me to go back to Control Panel.