I have my system setup to run updates on shutdown, but just a couple minutes ago I got a windows message saying that updates were ready to install. I clicked OK, but now wonder if it's legit. It keeps popping up asking me to restart my computer. If I click or right-click on the icon in the taskbar, it says that the updates are not finished and do I want to restart my computer now or later. It really looks real, but I'm hesitent in letting it restart. My AVG didn't pick anything bad up this morning and it usually will grab anything devious pretty quick. Any advice?

UPDATE: It looks like this is it, so it seems legit, but is there a way to know for sure? http://www.gadgetell.com/2006/07/how-to-tuesday-updating-your-computer-is-almost-complete-restart-now/

And this was helpful: http://asomewhatinterestingblog.wordpress.com/2006/06/27/how-to-stop-the-irritating-updating-your-computer-is-almost-complete-restart-now-message/