To any one as apprehensive as I was about installing sp2,dont be.Mine auto downloaded and I clicked on the install icon and it then did it all itself with the help of one or two clicks from me. Don`t worry if it appears to halt for a bit,it will go on. There does not appear to be any problems. My OS is XP Home.Meshuga.
There is a difference in size as SP2 only downloads the patches that you haven't got so in my case as ALL my security patches were UP TO DATE my download was only 75 mb. By the way it installed flawlessly with NO conflicts and also NO programs appear to be giving me trouble (yet anyway) but mind you this is my first day of running it. CW