Many people have a misconception that their computers are protected from all kinds of virus threats as they have installed a good quality anti virus. But the truth is that anti virus software is not the remedy for all kinds of computer problems. Though anti virus may protect your PC from virus but there are some kinds of threat which anti virus software cannot prevent.

Hacking ? Every one is aware of the word ?hacking?. Anti virus software cannot protect your PC from hackers. In order to protect your PC you need the system that will detect intrusion, constant vigilance and firewall. It is hoped that more powerful anti virus software that will be able to prevent hackers will be introduced in future. Presently Norton Internet Security system is incorporated with intrusion identification system, anti virus and firewall.

Behavior blocking ? Behavior blocking is a word, which is used to describe the technologies, which defend malicious applications from entering in your operating system. As all the other anti virus applications identify, remove and protect infections by applying definitions which are signatures of threats, these should be updated so that they can protect you against new threat. For example there is a kind of behavior blocking technologies, which sends mail to everybody in the address book of yours from being able to enter in the address book to defend virus. Another type of behavior blocking is used to prevent virus from ruining the key process, which protects the system.

Spy ware ? Spy ware threat has become the most common threat to all computer users in recent years. It is an application, which tracks your PC activities i.e. how you use PC. Unfortunately most of all anti virus solutions are unable to scan these kinds of threats. You need to have a spy ware cleaner to identify and clean spy ware.

In memory threat ? Viruses mostly affect a file and the viral code runs at the same time when the application is running too. Anti virus scanner usually scan files and search for viruses in the file system. But some rare infections such as W32.Slammer are not written to disk and affect an application while it is running. As the anti virus software only scans files instead of memory used by the application it cannot detect these kinds of threats. You should immediately terminate or disable and patch an application if it is suspected to have an in-memory security exploit.