A decent beginning for an end user, not a professional
While yes, this article does seem a bit light, I think it's a good starting point for your average home user running XP. It goes through some basic points and gives a rough idea of where to begin. This however, is *not* an article an IT professional should be struggling through - this should be stuff the professional should already know.
Assuming this is for an end user though, what I would really like to see is even more emphasis on preventing a spyware infection. This article is a little too reactive for my taste - the system has already been compromised, and here's what to do to keep it from getting worse. I agree with TG2 - more information about inbound firewalling and more information on proactive blocking.