Very common Windows problem. You need to rebuild the repository folder. If you Goggled your problem you will find your answer. I imagine your on XP. Go to Start\run and type "services.msc". When that opens scroll down to the WMI service (Windows Management Instrumentation) and stop the service. Then quickly go to C:\Windows\System32\wbem and delete the repository folder. Empty the recycle bin and reboot.
Real Time Protection = NIS 2009 + NAT Behavior Analysis = Threatfire On Demand = MBAM