security updates

From: *** (bigclick6_at_hotmail.com)
Date: 05/31/03 

Date: Sat, 31 May 2003 04:43:29 -0700

Hi and thanks for your time;
I have noticed that many times when live updates is
searching for new updates to install, live updates finds
updates which have already been installed on my computer.

I would like to know if these updates will be installed
twice if I dont notice , I have XPhome 2002,

thanks agin ***