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What exactly is a computer virus? The easiest way to understand computer viruses is to compare them to a biological virus whichgets into your system and makes you ill. These micro-organisms establish themselves in host cells of the human body and falsify the cell information so that they begin to produce the virus too. The same basic principle applies to computer viruses: There are the boot record viruses which generally infect the boot or master boot record of hard disks or the boot record of floppy disks. The boot or master boot record contains all the essential information for the boot routine, and can be modified by a virus. Unless, of course, the virus is detected ... Then there are the file viruses, which can attach themselves to a host file and modify the program size of executable files. Unless, of course, the virus is detected ... Another type is that of macro viruses, which combine a series of commands into a single complex. Macro viruses tend to anchor themselves in document templates that way they can spread rapidly to all documents derived from the template. Unless, of course, the virus is detected ... Many viruses also have a program component in addition to their reproductive component, which triggers reactions according to certain criteria, e.g. a certain date, a certain day of the week, special keyboard inputs, etc. As a rule, the virus remains unnoticed until the trigger criterion is fulfilled and the intruder begins executing its actions, which may or may not be amusing. For example, you may see an ambulance driving across your screen or find your letters falling like autumn leaves or be confronted with the message "Donald Duck is a lie!". In other cases, your file may be deleted or the data of your hard disk encrypted. This is less amusing. Here are links to some good free Anti-virus software AntiVir® Personal Edition for Windows Here are links to good pay for Anti-virus software Norton's Anti-virus software Here are links to good online Anti-virus scanners |
