Appears that the BIOS Update Box, after the BIOS downloads and you click install, hides behind the Suppler Assist Program box.  If it is moved out of the way, you can continue to have it install.  However, I agree with the above in that the Support Assist program should show the progress of the download as well as inform you that it is ready to continue the installation.
Last night, after I ran Support assist, I clicked on Update to get updated BIOS software. The "Installing" message stayed on for an hour with no indication of progress. I became impatient and clicked Cancel, at which time I got the notice "Updating BIOS, Please Do Not Turn Power Off". Within a minute or so, an "Update Successful - Restart?" message came up. I clicked Yes and all works okay. I have no idea how long I waited unnecessarily. What is needed is a progress bar or some way to tell the user when the update has been downloaded and is ready to install.
SA, update BIOS problem