After doing a re-install of Windows XP Pro (Reference Q_21844474.html) and re-installing SP2, I immediately ran Microsoft Update, which worked fine, and installed all the updates. Then I proceeded to install several applications that I use every day. After installing these applications, I tried to run Microsoft Update and after several seconds, a screen appeared with the options menu on the left with Review your update history and Restore hidden updates grayed out and a blank screen on the right, no buttons for Critical Updates, etc.
On boot-up earlier today, I had an update icon in the system tray which I clicked and a Microsoft update was installed. So it appears that the automatic update is working.
What do I need to do to be able to manually access Microsoft Update?