The Windows XP Security Center: tweaking guide
 

With the introduction of Windows XP Service Pack 2, Microsoft introduced the Security Center. There are many opinions about this new feature but in general I feel that it's a good thing. My fellow geeks view it as an annoyance and like me they have disabled it altogether. However, the intent of the Security Center isn't to help those who know how to secure their computer but rather to assist those who do not. By creating the Security Center, Microsoft has made an attempt to make the web a better place for geeks and non-geeks alike by, for lack of a better phrase, "protecting people from themselves". I like the fact that it is there, even if I don't use it on my personal computers. I do have it fully operational on my Mom's computer. This is a simple introduction and how-to for the Security Center. I'll introduce the Security Center to you and show you how to enable/disable the main settings.

http://www.tweakhound.com/xp/securitycenter/index.htm