Start>control panel>security centre. Select, under "resources", "change the way security centre alerts me". Un-tick the boxes you prefer not to be alerted about.
Why anybody would want to do this is beyond me.
Security alerts/updates are usually there for a very good reason.
I have mine set to "notify, but don't download or install them". That way I (and you) can choose what updates to apply. (In my case, that's usually most of them.)
If you subsequently click on the yellow shield when it alerts for updates, and there is one you don't want, you can select the option that reads something like "do not notify me regarding this update again."
I am running WinXP, Firefox, 256 ram, P-4 1.6. I very seldom use windows update, (I prefer to pick and choose what is installed.)
The last time that I used Win update, there was an update that had given me problems before so I didn't install it. Now every time that I boot the computer, I get the message that there are updates for my computer, with a yellow shield. Is there a way to eliminate this shield and warning? Thanks, Bill