Antivirus engine not initialized does not trigger System status to go to RED
If somehow one of the av .cav files end up corrupt the System Status stays green and keeps telling everything is running fine. But if you try to do a Run a Scan it will complain that the AV scanner is not initialized. - Running Diagnostics did not fix the problem also.
Found at least on XP/Vista x32, probably also on x64.
This could leave people to believe they are safe, but the AV is not working during this error situation.