Under Windows update there is a setting called "Optional Updates" have a look under that as Windows checks with the major motherboard manufacturers and software vendors to check if there are any "optional" updates that you can apply. This negates the associated risk that can come from running a straight BIOS update as Windows takes a backup copy of your BIOS and does a verification check that it applies correctly before rebooting, if it fails verification Windows reboots and puts the original BIOS back.
I've had it roll back on a fair few machines at work when we push it remotely or via a manual update.
