Let's try simple. A link and one thing I always do.
2. Set your browser default to be Internet Explorer while troubleshooting this.
Be sure you are not chasing the well discussed .NET update failure.
I have my computer set to notify me about updates, but recently, nothing happens when I try to download the updates. When I click on the update icon, it just disappears then reappears again later. I'm trying to install Service Pack 3. On the Microsoft site it says to click "start" then "all programs" then "windows update", but there is no windows update there! When I tried to go to the windows site to download it I get an error. What the heck is going on?