Updating antivirus software
An antivirus software basically works by analyzing program files against a robust list of current signature/virus definition files; any program that matches a signature/definition file is treated as suspicious and is either deleted or quarantined.
An alert would appear to warn the user of the threat.
Once installed, the malware will deliver some sort of a (from simply spreading itself again to installing a keylogger to track everything you type) and attempt to spread itself further.
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Here the known files would be allowed entry and would run in the system while the unknown ones, irrespective of whether they are good or bad, are sent to the Defense Sandbox.
These would be allowed to run, but only in this restricted environment.
Those that match the signatures are classified as viruses and are blacklisted.
The other program files then pass through the Defense HIPS ( Host Intrusion Prevention System).