Yes, with Windows XP SP2, it nags you to death until you either turn on auto-update or update manually. So if you haven't been nagged in the last few minutes, it's likely auto-updating. Though it sometimes seems otherwise, it is a good thing to keep your OS as up to date as possible, especially since Microsoft is often 6 months or more behind on patches. Anyway, here is where you can find the official sound driver for your laptop.

All the best,
-AT