Computer Software
Installing and Configuring Software
Preparing to Install Software
Uninstalling Software

In the days of DOS and DOS applications the procedure for removing unwanted applications from the hard disc was by backing up any data created, deleting its sub-directory and removing its entry from any custom menu system being used. To do that with modern day software and operating systems would be inviting disaster, most software now has to be installed, although there are still some small applications that run as a stand-alone executable file. It is always dangerous just to delete program files in order to uninstall an application - to do so will almost certainly result in serious damage to the operating system.
With the sophisticated operating systems available today most applications have an un-install program, which will remove all application files, including those shared with other applications, remove the application directory and all entries from the registry or files holding start-up and running instructions. Windows 95/98/98SE/ME/NT4/2000/XP operating systems all have a Control Panel utility called Add/Remove Programs, which will use either the application’s own un-install utility or carry out the process itself. The Install/Uninstall Tab from Windows ME is shown below. 

The Adobe Acrobat program has been highlighted for removal and the Add/Remove button is available. When the Add/Remove button is clicked a warning is given as files will be deleted. The Adobe Acrobat un-install program is run, placing a tick next to a task as it has been completed. Generally the computer will need to be re-started to ensure the complete removal of a program. Sometimes operating systems can be removed this way, but are usually removed by backing up data, deleting the files and reformatting the drive.