#1 p2p
"peer to peer" of "P2P" is a type of network architecture used by many users, while utilizing third party software like Limewire, to share various files and programs. P2P networks tender users with the ability to share and manage programs and other files, with each other. There are more than a million users using P2P networks to share such files like mp3, videos, etc. P2P networks offering convenience and fast paced downloads, unfortunately also offer a host of spyware and malware programs, which usually take a piggy back ride on such files, when the user unsuspectingly downloads such a file, he infects his computer in the process.

#2 Potentially Unwanted Applications
PUAs or Potentially Unwanted Applications are programs that are forced unto to you, while you install some applications. These programs, unless not installed, will not let you install the application that they come bundled up with. Potentially Unwanted Applications are usually not harmful and well are just unwanted applications. Many such applications may also be useful to an individual and there is no harm in using these too.

#3 Rogue AntiSpyware
Spyware programs that disguise themselves as anti-spyware software are known as rogue anti-spyware; essentially these anti-spyware programs have attitude. Some of these rogue anti-spyware programs are plainly product promotions and they usually never work. Some of these rogue anti-spyware applications detect themselves as potential threats and are actually spywares rather than protectors of our PCs against such threats. It is very difficult to separate genuine anti-spyware products from rogue anti-spywares, hence it is inherent that you download only tried and tested anti-spyware and anti-malware software applications.

#4 Spyware
Spyware is termed that includes a very broad range of unwanted and potentially dangerous programs or applications that can infect your computers. These programs usually tend to violate your privacy, usually by allowing some third party to eaves drop on your activity while using your computer. These applications are extremely dangerous and your personal information, including proprietary information like banking details, checking account details, etc are transmitted to the third party. Examples of spyware include key loggers and tracking cookies. All most all computers connected to the Internet have suffered or will suffer spyware threats of some form or the other. It is highly recommended that you download and install anti-spyware and anti-virus software that offer you comprehensive security.

#5 Tracking Cookie
Tracking cookies are everything but innocent little session storing cookies. Tracking cookies are capable of storing all your internet activity. These cookies then either wait to be lifted up by the author websites or themselves transmit the data on a regular intervals to a third party. What kind of information does get transmitted depends solely on your internet usage, if you are banking online, this information does get saved. This infomraion can then be used as pleased by the third party. No matter what some websites indulging in placing such cookies in your browsers cache may say, these cookies are a complete violation and invasion of your privacy and you should get rid of these using apt anti-spyware.