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McAfee security center
(Kindov confused)
Well, I didn't install the Protection Shields for Avast so they don't conflict with McAFees Rt scanning
How do I know if Avast is running on residential?
avast is designed to be a resident antivirus, you need only look at the task manager and you will see avastUI.exe and avastSvc.exe running.
The fact that so far you have been lucky is no indication that they don't conflict, resident scanners install low level drivers that are designed to hook files before they run so that they can be scanned. This can be the same as two dogs fighting over one bone.
At best this could be no more than cause scanning duplication as both resident scanners try to hook and scan the same file. At worst the low level drivers could lock your system as one locks a file the other is trying to scan, now if this happens during boot it could lock you out of your system.
So luck rather than design, so I suggest you read the links given by Pondus above in Reply #17.