When many computers have been hacked to turn them into zombies computers, we call such a group a Botnet. Those computers are being used by cyber criminals to send spam emails and/or to attack websites. The way such a group of computers was created is with the help of compromised applications called "bots". Those bad programs will turn your PC into zombie one that hackers can control at distance with the help of a "bot-herder" command system and a control server. One of the most dangerous threat menacing the cyberspace are the Botnets. Those groups of zombie computers can do lots of damages to personal PCs, whole networks, and more. Botnets can be used to send spam and to send malware, adware, worms and such threats. Denial of Service (DoS) and Distributed Denial of Service (DDos) are 2 others popular methods to hurt servers that hackers are doing with those Botnets. They will try to massively overload a system so it won't work anymore because there are too many requests to acceessit at once. Here Online Virus Removal you can find a great online service ready to repair any problems your PC may have.

Trojans, viruses, malware are used to infect computers with Botnet's code. These Trojans and viruses may be delivered to the user in the form of spam emails or they could get downloaded from malicious websites, posing as essential video and audio codecs. Once it is part of yur PC, the Botnet program will communicate with its bot-herder server to wait for more instructions. Such instructions might include to start sending lots of spam emails, or to attack a remote website or server, or simply to propagate the Botnet to others PCs. Most of a botnet’s activity occurs without the user noticing any major difference in their computer; therefore it is important that users have a clear understanding of how to recognize a botnet infection. This site Spyware Removal has good infos about spyware removal.

If you do notice your PC is slowing down, this might be a sign it is infected with a botnet. Another problem is that your internet own connection will be slower than usually. This is because the botnet is connecting itself to lots of places. You might notice 2 more things: you have less hard disk space than before and your browser is not working as usually. Your PC might be infected by a botnet if you do notice that your browser (Firefox, IE, Chrome, ..) is closing with no apparent reasons or its homepage is a different one or if your desktop has been change a lot.