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Malware removal These tools are also difficult to manage in a non-boot situation, or during an infestation, compared to a full system restore from a backup. In the age of rapidly evolving malware, even a full system restore may be unable to rid a hard drive of a bootkit.

Registry cleaners are likewise not designed for malware removal, although minor side-effects can be repaired, such as a turned-off System Restore. However, in complex scenarios where malware such as spyware, adware and viruses are involved, the removal of system-critical files may result.

A registry cleaner is of no use for cleaning registry entries associated with a virtualised application since all registry entries in this scenario are written to an application-specific virtual registry instead of the real one.

Complications of detailed interactions of real-mode with virtual also leaves the potential for incorrect removal of shortcuts and registry entries that point to "disappeared" files, and consequent confusion by the user of cleaner products. There is little competent information about this specific interaction, and no integration. In general, even if registry cleaners could be arguably considered safe in a normal end-user environment, they should be avoided in an application virtualization environment.



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Antivirus Programs

Before internet connectivity was widespread, viruses were typically spread by infected floppy disks. Antivirus software came into use, but was updated relatively infrequently. During this time, virus checkers essentially had to check executable files and the boot sectors of floppy disks and hard disks. However, as internet usage became common, viruses began to spread online.

Over the years it has become necessary for antivirus software to check an increasing variety of files, rather than just executables, because virus programs are becoming sophiscated

Powerful macros used in word processor applications, such as Microsoft Word, presented a risk. Virus writers could use the macros to write viruses embedded within documents. This meant that computers could now also be at risk from infection by opening documents with hidden attached macros. The possibility of embedding executable objects inside otherwise non-executable file formats can make opening those files a risk. Later email programs, in particular Microsoft's Outlook Express and Outlook, were vulnerable to viruses embedded in the email body itself. A user's computer could be infected by just opening or previewing a message.

With all these developments anti-virus companies have to develop different advanced methods of detecting virus.

Antivirus software is simply a software with set of instructions that directs a computer to perform specific operations. Computer software consists of computer programs, libraries and related non-executable data. Computer software is non-tangible, contrasted with computer hardware, which is the physical component of computers. Computer hardware and software require each other and neither can be realistically used without the other.

At the lowest level, executable code consists of machine language instructions specific to an individual processor—typically a central processing unit. A machine language consists of groups of binary values signifying processor instructions that change the state of the computer from its preceding state.

For example, an instruction may change the value stored in a particular storage location inside the computer—an effect that is not directly observable to the user. An instruction may also (indirectly) cause something to appear on a display of the computer system—a state change which should be visible to the user. The processor carries out the instructions in the order they are provided, unless it is instructed to "jump" to a different instruction, or interrupted.

Software written in a machine language is known as "machine code". However, in practice, software is usually written in high-level languages that are easier and more efficient for humans to use than machine language. High-level languages are translated into machine language using a compiler or an interpreter or a combination of the two. Software may also be written in a low-level assembly language, essentially, a vaguely mnemonic representation of a machine language using a natural language alphabet.

Software is often divided into two categories. Systems software includes the operating system and all the utilities that enable the computer to function. Applications software includes programs that do real work for users. For example, word processors, graphics, spreadsheets, and database management systems fall under the category of applications software.

Software are separated into different categories.

Shareware or trial software is software that gives you a few days to try the software before you have to buy the program. After the trial time expires, you'll be asked to enter a code or to register the product before you can continue to use it.

Freeware is completely free software that never requires payment, as long as it is not modified.

Open source software is like freeware. Not only is the program given away for free, but the source code used to make the program is as well, allowing anyone to modify the program or view how it was created.

Is free antivirus good?

Free software is good, if it comes from a confirmed source like a well known software company. To use free software is to make ethical choice asserting the right to use , learn, and share what we learn with others. Free software has become the foundation of a learning society where we share our knowledge in a way that others can build upon and enjoy.

Currently, many people use proprietary software that denies users these freedoms and benefits. If we make a copy and give it to a friend, if we try to figure out how the program works, if we put a copy on more than one of our own computers in our own home. These softwares can steal information on our computer.

The corporations behind proprietary software will often spy on your activities and restrict you from sharing with others. And because our computers control much of our personal information and daily activities, proprietary software represents an unacceptable danger to a free society.

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