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AntiSpyware
Antispyware is a computer software that helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software

Antivirus
Antivirus software is a computer program that detects, prevents, and takes action to disarm or remove malicious software programs, such as viruses and worms. Computer viruses are software programs that are deliberately designed to interfere with computer operation, record, corrupt, or delete data, or spread themselves to other computers and throughout the Internet. (Phentermine)

Address Harvester
An Address Harvester is a robot that scans or “crawls” websites, Net news, forums etc. for anything that looks like a valid email address. This results in large amounts of email addresses which will be used to send out spam, or sold to spammer.

Adware
Adware is software that has been installed on your computer without your knowing. Many freeware or shareware programs that you download from the Internet will install hidden programs, that send details such as i.e. your email, websites you visit etc. to an advertiser who can target you with popup ads (often even if your offline) and spam.

Attachments
An attachment is a file that is sent along with an email message i.e. if you include a file with an outgoing email message. Be careful about attachments. Attachments can contain malicious programs, such as viruses and Trojan horses. If you receive an attachment from someone you do not know, you risk that it might be a virus or Trojan horse, which will be activated when you click on it!

Advanced Fee Fraud
A very common scam in which a fee is demanded from the victim in advance of the victim receiving a lottery winning, a loan, money from a dead relative, etc. Often these scammers are based in Nigeria, the Netherlands or China.