Hi Zakath,
Is your Adwatch set to
Active or
Automatic? See the
green tick and the
red cross in this screenshot:
Click to view attachmentAutomatic silently blocks all changes to your system (whether desired or not, good or bad), whereas Active pops-up an alert each time an attempted change is detected. Read the alert, and if you are happy with the change (or initiated it by installing/editing a program etc) then Accept it.
If an alert appears out-of-the blue, be very wary as to the change being made.
In your case, it could be that McAfee virus-scan needs to make some changes to run efficiently, but is being blocked persistently.
Regards,
Spike