There could be multiple reasons for this. e.g. you PC is not online log
enough for auto update to scan the windows update site and notify you. Or you
have dial up or slow speeed connection that it takes time to find this
informationn
I also thought I had a problem, but just wait. One day
you will turn on your machine and SP2 will start
downloading. It's being dribbled out to keep from
overloading the Microsoft Servers.