Viruses are destructive form of software. They were purely designed and created for one purpose alone: to wreck havoc to your computer. They destroy whatever they come in contact to and will initiate self replication and infect as many components of the computer's operating system or network as possible.

There are a lot of reliable adware and spyware cleaners in available to remove these unwanted programs in your computer. You must note however that some adware and spyware are intricately bundled within their parent programs that cleaning them out from your computer will inadvertently disable the legitimate programs they infect. This consequence is a necessary evil to clean your computer of unwanted adware and spyware. You should choose an adware and spyware cleaner that can also work proactively by preventing future accidental installation of these nuisances.

Adware are unsolicited programs that usually come bundled with freeware or shareware. Yes, sometimes things that seem to be good to be true usually come with unwanted invisible strings attached. Companies usually pay freeware or shareware creators to be able to capitalize and prey on unsuspecting individuals who download these programs. Adware cause unsolicited pop up advertisements in your computer and in severe cases, adware causes pop up advertisements to pop up soon as you boot your system.

Spyware on the other hand is more covert and usually undetected in your system until you run an anti spyware program. Spyware is used exactly to spy on you. In relatively mild cases, spyware is used to track your Internet browsing habits so that the spyware can report your preferences to build a marketing profile. This means that as you go about your Internet business, you are under surveillance and your basic right to privacy is impinged upon.

The spyware then will send the information that it had gathered to the spyware author. The agent will then use this information for advertising and marketing purposes. They even sell the information to advertisers and other parties.
Adware, on the other hand, are more legitimate form of freeware. Similar to spyware, adwares are advertising materials which are packaged into a software or program and are installed automatically once that particular program or software is added into the computer system. Some forms of adware, on the other hand, download advertising contents as a particular application is being utilized. It is quite unfortunate that most of the adware programs take the form of spywares that is they track and report user information to program authors.