I'm not sure of what your problem may be, but Windows Updates will not automatically install optional updates like drivers and such. You might also double check with this tutorial below about the settings.
i have the settings correct as in your link,thisw is for all including critical updates,but i still need to go to security center `[in xp i get a popup in the notification bar] but not on vista
hi all,bad news,i have just checked my security panel and i have i 1 important update from microsoft,so my problem has not been solved ,¿where do we go from here?
Perhaps it failed to install for some reason, or the scheduled time to install them has not arrived yet. Double check through these troubleshooting items from Microsoft to see if they may be able to help any to.