My parents recently gave me their laptop and it's windows XP. However when the yellow shield appears at the bottom right of the screen to announce new updates, it can't install them. There's a lot of updates, about 30 roughly. I don't know how they built up into such a large quantity but it can't install.
If the laptop has a firewall, turn it off and see if the updates install then.
Also, make sure the browser is set to allow ActiveX controls to run. If the browser is set to stop ActiveX controls running I think that stops Update running.