Define computer virus?
A computer virus is malicious code that replicates by copying itself to another program, and changes how a computer works.A computer virus can be spread by opening an email attachment, clicking on an executable file, visiting an infected website or viewing an infected website advertisement.It can also be spread through infected removable storage devices, such USB drives.
Below are Some of reason from where computer viruses comes into your computer system,
-> Sharing files may be music file or photos which is already already infected.
-> Surfing infected Web site.
-> Reading spam email which have virus in it.
-> Downloading virus infected file into your computer.
Malware is also a computer viruse.
Below are the symptom show if your computer is infected by virus or malware,
-> Computer goes extremely slow
-> unaccepted computer behaviour
-> Unexplained data loss
-> Frequent computer crashes
Now you can perform some activities to protect your computer from viruses,
-> Use anti-virus and firewall.
-> Get antispyware software.
-> Always update antivirus protection and antispyware software.
-> Get updated antivirus and operating system.
-> Download software from official sites .
Types of virus
The file allocation table or FAT virus attacks the File Allocation Table (FAT) of computer system, its alters the index table hence the data stored in it is not accessible we may lose our data completely.
A worm is self-replicate computer virus, that will badly effects your computer system.
Examples : PSWBugbear.B, Mapson, etc.
Trojans or Trojan Horses
Trojans or Trojan horses is a virus which can send personal data to other computer.
Logic Bombs execute in response to specific events and destroy data of computer .
Boot virus can affect boot sector of a floppy or hard disk, because of which computer system does not boot.
Examples : Polyboot.B, AntiEXE.
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