This blog own by Michelle Daso BSCS-2B
A virus removal tool is software for removing specific viruses from infected computers. Unlike general-purpose virus scanners, it is not intended to detect and remove, ideally, all known viruses; rather it is designed to remove specific viruses more effectively and completely than a general-purpose program. Many single-virus tools will be found searching the Worldwide-Web for "virus removal tool"; others, such as McAfee Stinger and the Microsoft Malicious Software Removal Tool run automatically by Windows update, are designed to remove a limited numbers of viruses. Many of these tools are available for free download.
Studies in December 2007 have shown that the effectiveness of Antivirus software is much reduced from what it was a few years ago, particularly against unknown or zero day threats. The German computer magazine c't found that detection rates for these threats had dropped to a frightening 20% to 30%, as compared to 40% to 50% only one year earlier. Only one product managed a detection rate above 50%.
The problem is magnified by the changing intent of virus authors. Some years ago it was obvious when a virus infection was present. The viruses of the day, written by amateurs, exhibited destructive behavior or popped-up screen messages. Modern viruses are often written by professionals, financed by criminal organizations. It is not in their interests to make their viruses evident, because their purpose is to create botnets or steal information for as long as possible without the user realizing this; consequently, they are often well-hidden. If an infected user has a less-than-effective antivirus product that says the computer is clean, then the virus may go undetected. As a result of this, even major antivirus products have failed to detect programs containing malicious behaviour.

The New Generation's Of Computer's Now!

A computer is a machine that manipulates data according to a list of instructions.
The first devices that resemble modern computers date to the mid-20th century (1940–1945), although the computer concept and various machines similar to computers existed earlier. Early electronic computers were the size of a large room, consuming as much power as several hundred modern personal computers (PC).Modern computers are based on tiny integrated circuits and are millions to billions of times more capable while occupying a fraction of the space. Today, simple computers may be made small enough to fit into a wristwatch and be powered from a watch battery. Personal computers, in various forms, are icons of the Information Age and are what most people think of as "a computer"; however, the most common form of computer in use today is the embedded computer. Embedded computers are small, simple devices that are used to control other devices — for example, they may be found in machines ranging from fighter aircraft to industrial robots, digital cameras, and children's toys.
The ability to store and execute lists of instructions called programs makes computers extremely versatile and distinguishes them from calculators. The Church–Turing thesis is a mathematical statement of this versatility: any computer with a certain minimum capability is, in principle, capable of performing the same tasks that any other computer can perform. Therefore, computers with capability and complexity ranging from that of a personal digital assistant to a supercomputer are all able to perform the same computational tasks given enough time and storage capacity.