I have the same problem, that is, when I use wireless my computer identifies the router as "UNIDENTIFIED NETWORK" and connects with "Local Only". The wired connection works fine. I have tried everything proposed in this thread, including the KB928233,
rebuilding the IP stack, Norton removal tool, everything. Nothing works.
What is really frustrating is the Microsoft must know that this is an unresolved issue, because it is clearly quite widespread, and yet they do not fix it. The only solution they propose here clearly doesn't work in many cases.
That is frustrating, but not surprising. Microsoft uses their customers as un-witting beta testers for all of their operating system releases.