Mike, Thanks for the reply. That was my thought originally.
We have had issues in the past where the McAfee firewall would block the NAC agent from popping up. After turning the firewall off, the NAC agent would pop up just fine. As for our computers in question, only one of them had McAfee Virus Scan on it. We ran the McAfee removal tool, but it still did not seem to work. When this issue first came to a head two weeks ago, it seemed to occur after Windows pushed updates. We checked the NAC manager to see what updates were installed. We tried uninstalling those updates, and rebooted the computer. This did not work. We also used System Restore and went as far back as two weeks ago. This also did not work. I'm not sure if Windows updates had anything to do with what is happening, it is only speculation at this point.
