New
#11
Because it would be nice to prevent some infections so that you did not have to rebuild the OS. That said, signature based anti-virus tools will always be playing catchup and the heuristics in most AV tools are just not good enough to prevent all infections. There are types of infections that are not be detected by antivirus tools like AVG, AVAST, NORTON, MSE.... so your system could be infected right now and you would not know it.