Well, guess what??? Dummy dummy me!!
Everything is fine and A-ok. I was under the impression SP2 would have "detected" that AVAST was installed: I did not have it running in the background (made sure it was disabled during the SP2 install).
When I re-set AVAST to automatically start with Windows, it now shows up in SP2 Security Center!
Sorry guys....everything is working as it should be!