There are different types of computer network security software to keep your computer safe from online threats. Firewall is a popular choice of most households as well as businesses to keep hackers at bay. While Norton is a popular brand, there are others too who can do an equally good job. Some routers now come with a pre-installed firewall to protect computers from potential dangers. You should also use antispyware software that can be even downloaded for free from the Internet. Failing to have this software can be devastating, as you may lose sensitive data an even incur financial losses due to your inability to protect passwords used for online transactions. Always have antivirus software installed on your computer to avoid losing your entire data. You can buy computer network security software online after going through various software reviews.