Brief description
Virus
A computer virus is a self-replicating program that spreads by inserting copies of itself into other executable code or documents and it behaves similary to a biological virus. There are hundreds and thousands of them in the world.
Worms
It is a similar program as a computer virus with the main ability to infect computers over the internet. Usually their main purpose is to attack certain web sites or to act as a Trojan horse.
Spyware
Spyware programs are installed on your computer without your knowledge. Spyware can steal your personal information and increase your risk of identity theft. Spyware can track and record your online activity (surfing habits). Spyware is downloaded to your PC as you surf websites, download files and read emails.
Adware
It is designed to display unwanted advertising on your computer and can really slow your PC down.
Keyloggers
Such software can record every keystroke you make on your computer. Therefore it can steal your passwords and other personal data.
Browser hijackers
This little tools will change your home page in Web browsers and search results.
Trojan horses
They are also called Remote Access Trojans or RATs and allow an attacker to remotely control your computer.
Malware
This is short for malicious software/threats and is typically used as a catch-all term to refer to any software designed to cause damage to a single computer, server or computer network, whether it's a virus, spyware, trojan horse...
http://www.tnode.com/VirusClassification

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11 Ways to Prevent Computer Viruses


11 Ways to Prevent Computer Viruses

It doesn’t matter if you’ve been on the Internet for five minutes or five years, you’ve probably thought about ways in which you can prevent a computer virus from entering your machine. A virus can compromise your personal information and even destroy your computer completely. Luckily, there are many low cost things you can do to protect yourself and stay one step ahead of the hackers. Here are 11 things you can do to help prevent computer viruses from invading your computer.