I keep getting security notices to download and install Windows Genuine Advantage KB 905474. However, my computer shows that this particular security update is already installed. As a matter of fact, I went to the MS Diagnostics website for this service and passed with flying colors. That is when Add/Remove Programs shows that this update was installed. Now, I still keep getting update notices for this particular update, and when I try to download and install from this notice, it always goes through the process and ends up saying Install Not Completed. That's it. And the next day, I am once again notified that I need to download and install KB 905474. Any ideas?