The heuristic approaches in a windows antivirus software using free antivirus program is typically done to utilize a variety of strategy in locating viruses that could be causing harm on a workstation. This kind of approaches detect newly discovered viruses and updates information about existing viruses on the list of the antivirus software. For your computer to be guarded, it is a good shot to utilize the right antivirus software that will help your system to be out of computer viruses.