What are the effects of computer virus

[CAILYN]

There are different types of viruses, I want to know the different effects of computer virus and their effects on computer data. And the threats of virus. How it over loads the server and relay on spam. And which viruses offently effect the system.

[Milton.J]

Viruses generate very different consequences (cost) on machines infected by the family of origin to which they belong. Most dangerous to the user delete data, steal confidential documents, listen to the network and preventing the boot. Today, security experts see the emergence of a new threat: the bots or zombie computers.

[Spyrus]

The computers infected by a virus creator to provide virus access to virtually complete PC infected through a back door (backdoor), often a network port open to an IRC server. These machines can then run commands remotely as relaying spam, viruses or even overloading the server Web site until it collapses under the load of requests.

[Big Fish]

The virus incorporate their own engine to send emails they use to pass - under false names - messages containing the virus strain. The recent focus now to the instant messaging applications and networks for exchanging files (peer to peer). We call this method of attack in denial of service.