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Installation (computer programs)
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Installation (computer programs) : ウィキペディア英語版
Installation (computer programs)

Installation (or setup) of a computer program (including device drivers and plugins), is the act of making the program ready for execution. Because the process varies for each program and each computer, programs (including operating systems) often come with an ''installer'', a specialized program responsible for doing whatever is needed for their installation. Installation may be part of a larger software deployment process.
Installation typically involves code being copied/generated from the installation files to new files on the local computer for easier access by the operating system. Because code is generally copied/generated in multiple locations, uninstallation usually involves more than just erasing the program folder. For example, registry files and other system code may need to be modified or deleted for a complete uninstallation.
==Overview==
Some computer programs can be executed by simply copying them into a folder stored on a computer and executing them. Other programs are supplied in a form unsuitable for immediate execution and therefore need an installation procedure. Once installed, the program can be executed again and again, without the need to reinstall before each execution.
Common operations performed during software installations include:
* Making sure that necessary system requirements are met
* Checking for existing versions of the software
* Creating or updating program files and folders
* Adding configuration data such as configuration files, Windows registry entries or environment variables
* Making the software accessible to the user, for instance by creating links, shortcuts or bookmarks
* Configuring components that run automatically, such as daemons or Windows services
* Performing product activation
* Updating the software versions
These operations may require some charges or be free of charge. In case of payment, installation costs means the costs connected and relevant to or incurred as a result of installing the drivers or the equipment in the customers' premises, and includes any costs payable by the company in respect of deciding to enter into this agreement with customer.
Some installers may attempt to trick users into installing junkware such as various forms of adware, toolbars, trialware or software of partnering companies. To prevent this extra caution on what exactly is being asked to be installed is needed. The installation of additional software then can simply be skipped or unchecked (this may require the user to use the "custom", "detailed" or "expert" version of the installation procedure).〔
Such malicious conduct is not necessarily a decision by the software developers or their company but can also be an issue of external installers such as the Download.com installer by CNET.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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