Windows security thinks McAfee is still there.

I just finished gutting all the junk out of a new E510 a friend of mine just bought. Since Dell completely ignored the options I chose when setting it up and put a load of trial software on the system (and forgot to install the X-Fi card) I've had to spend hours at this. Finally I've gotten it all cleaned up down to one little problem. I uninstalled McAfee Security Center Trial via add/remove. I know you are suppose to shutdown and uninstall individual components first. Problem is 1)McAfee kept restarting itself when I shut it down, 2) there were no individual components listed, just an entry for the security center. Finally it stopped restarted and I removed it. After reboot I went about finishing the sytem cleanup and suddenly realized Windows Security Center wasn't nagging me about not having an AV installed. So I checked it and found it was reporting McAfee as still being present. Firewall, Spam Killer, etc. all seemed to be completely gone. So I went through various steps on McAfee's site, downloading the individual clean up programs for each component and sorting throught the registry to get rid of all McAfee entries and I still have Windows Security center telling me McAfee is installed. I just turned off Windows Security Center service for now since this computer will be used offline for at least a couple months and I don't want it nagging him about outdated software. Eventually, it'll be put online though and I'll be installing AVG or Avast along with a software firewall. I need to make sure McAfee is dead and buried before this, but I'm all out of ideas. Any input would be appreciated.