security attack

One of the typical methods that a hacker can employ is first running a scan to determine which IP addresses on a given subnet are active, then to determine which active IP's have open ports. Any open port is susceptible to attack, either through htp, http, ftp, smtp, or other protocols. If a hacker can successfully attach to your machine through an open port that has no filters or firewall blocking, he can have access to it through one of these protocols. Backdoor Trojan horse is one of the most common methods utilized by hackers. Why? Because you can. And there are enough people out there with nothing better to do than trying to attach and attack others vital and important private information.

Symantec has a good knowledge base siteyou may want to visit for more detailed information on the subject of virus protection, and hacking. URL has no spaces between characters:
http://www.symantec.com/techsupp/consumer.html