In this case, the guilty party is Symantec. If you happened to be running Cybersitter and updated your Symantec definition file, your AV software would have deleted parts and pieces of this software off your system leaving it useless. Actual results vary, but they range from no internet connection to rendering your computer unusable.
According to Solid Oak, the vendor of Cybersitter, Symantec is doing little to help. I can only sympathize with the frustration they must be feeling...
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Cisco Firepower Threat Defense (FTD): Configuration and Troubleshooting Best Practices for the Next-Generation Firewall (NGFW), Next-Generation Intrusion Prevention System (NGIPS), and Advanced Malware Protection (AMP)