Anti-virus software applications are very helpful in analyzing the virus and its threats. The users planning to buy any software applications should consider various package and select an application that offers maximum level of protection. An individual must understand that all viruses differ in their causes and threats. There are two main types of threats that affect most of the systems: Trojans and boot virus.
Trojan is a benign application and they are equally destructive when compared to virus. Trojans never replicate, but they trick the computer user to open it by posing as an application from the legitimate source. Most Trojans are annoying applications as they repeat some sound repeatedly, displays graphics, or even change the desktop. Some Trojans delete or damage any files and few even open a backdoor for many malicious applications and unauthorized users. This way, they become the threat to confidential and personal information.
The main target of most viruses and malicious codes is to damage the computer hard disk’s boot sector that has the program code of the operating system. The goals of this virus are propagation and replication. These virus normally attacks the system before booting up and even starts before any other application in the system starts working. Boot virus runs automatically whenever the system is booted. These virus are normally spread through exchange disks. Some of the popular viruses are boot virus, disk killer, form, and stoned. Most popular Trojans are Trojan.Emcodec.B and Trojan.Realsearch. Among these Trojans, Trojan.Realsearch always alert with false messages about the infected machine.