If it shows when running a manual update you either click on it or double click it and a box opens underneath just tick the little box not to show the update again.
That should do it.
After the 15th of this month I believe there will be no more updates for it or SP2.
My advice to anyone that can upgrade to W/7 would be to do it.
Must have spent at least 4 hours yesterday updating an XP computer after a reformat.
The outcome was that a computer with practically nothing on it took over 45 minutes to do a short scan using MSE.
Probably less than 10 minutes using W/7.
I can see why Microsoft are stopping support for XP.