Worms, Trojan horses and viruses are programs created by hackers and are used to infect computers risk via the Internet. Worms and viruses can replicate themselves from one computer to another, while Trojans hidden in apparently legitimate programs that you download from the Internet. The list of things that can go wrong with your computer is without end, a time that your computer is infected with a virus, worm, or Trojan horse. One of the first signs that you are infected is pop up ads and a big drop in the performance or speed of your computer.
Antivirus software scans your computer constantly in search of these wicked and if found quarantines malicious code or deletes until it can do harm to your computer and your data.
Windows XP does not have a built in anti-virus. AVG is an excellent free antiviru program that you can download from the Internet. Just Google this acronym to the download site and that you have defined for a good antiviru tool. An alternative is to go to the Microsoft's Antivirus Partners Web page and see what they recommend. Microsoft also has a program free out called Defender that is supposed to be good protection against viruses and spyware.
Virus challenge particular to detect due to the fact that they change on a daily or sometimes hourly. For this reason, it is best to choose an antivirus program with an automatic update capability. Updates of the software are to keep abreast of the ever present change in the types of viruses that are found on the Internet. If your antivirus software is not updated your computer becomes vulnerable to these new threats.
To completely cover your databases against these types of threats that weigh on your computer, don't forget and add a good firewall so that an anti spyware program on your computer for the best protection.
Please visit my computer security software for more information and free articles on securing your computer and data against any prejudice.