These are also called privacy-invasive software

While the term spyware suggests software that secretly monitors the user's behavior, the functions of spyware extend well beyond simple monitoring. Spyware programs can collect various types of personal information, such as Internet surfing habits, sites that have been visited, but can also interfere with user control of the computer in other ways, such as installing additional software, and redirecting Web browser activity. Spyware is known to change computer settings, resulting in slow connection speeds, different home pages, and/or loss of Internet or functionality of other programs. In an attempt to increase the understanding of spyware, a more formal classification of its included software types is captured under the term privacy-invasive software.

Adware or advertising-supported software adware is a software application in which advertising is displayed while the programme is running. This may take the form of pop-ups or banners which appear on the computer monitor. Advertisers pay for the service and help to recover some of the costs of software development, thus keeping the price low or even free, whilst the programmer still makes a profit. Adware may run on a computer without the users knowledge, having been included in shareware or freeware downloaded from the Internet. Most adware affects the various Windows operating systems and may be noticeable by the presence of more pop-ups on the web browser and a possible reduction in computer performance. Some types of adware are also spyware

Malware,  malicious  software, is software designed to infiltrate or damage a computer system without the owner's informed consent. The expression is a general term used by computer professionals to mean a variety of forms of hostile, intrusive, or annoying software or program code. The term "computer virus" is sometimes used as a catch-all phrase to include all types of malware, including true viruses.

One can use spybot search and destroy and Microsoft malware removal tool to get rid of these annoying things.

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