You should know that it's not advised to use Windows Update for anything other than Windows.
Windows Update does not search the internet for the latest
drivers specific to your system; instead, it relies on vendors to submit
drivers. If WU doesn't have the latest
drivers in its store, it can't give them to you.
If hardware vendors were religious about submitting their drivers to Windows Update, everything would be fine... but the reality is that the latest drivers don't often get submitted. I've seen guys repeatedly install outdated (and corrupt) chipset drivers because WU insisted they were the latest, and the user (unaware of how WU works), believed the message... frustrating himself to no end in the process.
For your chipset, video, and sound drivers, you should visit the corresponding manufacturer's site. It's not uncommon for there to be large gaps between the drivers in the Windows Update store and what vendors post to their site.