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. Hackers are controlling such botnets using a control server and a bot-herder command. This is done at distance once those computers have been turned into zombies ones. They become such thing when they are infected by “bots”. Small programs similar to viruses. Those Botnets can hurt networks, websites, personal computers, and more. They are one of the most dangerous problems over the Internet. Problems like viruses, malware, spyware can also be distributed via those Botnets, besides all the spam emails. They can also be used to perform ‘Denial of Service (DoS)’ and ‘Distributed Denial of Service (DDoS)’ attacks on servers, during which zombie computers are used to overload target servers with requests, causing the server to freeze from excessive information. Here Remote Computer Repair you can find a great online service ready to repair any problems your PC may have.

Botnets enter user systems via Trojans or viruses which carry the botnet’s code as the payload. Your computer might get infected by such trojan or virus if you do open any links in all those spam emails. You can also become infected by downloading any application like fake codecs coming from hacked sites while in fact you thought you were installing a legit video or audio codec. After having infected your computer, this threat will connect to its bot-herder server for further instructions. That includes sending more spam emails, trying to infect more computers and starting some kind of attacks on some servers. The first thing you should be aware is that most of the Botnet’s activities will happen without even you knowing about it. So you should understand what is a Botnet and how to detect it. This site Virus Removal Guides has good infos about spyware removal.

If your computer system is slower than usual, this is a sign something wrong is happening. Because the botnet is using the internet a lot, you might notice your connection is slower than usually. There will also be an inexplicable loss of hard disk space as well as your browser will be compromised. In other words, your browser will close unexpectedly, its homepage will be irreversibly changed, and your desktop will be inexplicably changed.