why are software's installed before use? you make mistakenly installed software that needs to be removed now. mention the three steps that will removed the software from your system.explain by uninstalling software?

INSTALLING SOFTWARE'S:
Most software programs require that you first install them on your computer before using them. for example, if you by Microsoft office, you need to install it on your computer before you can run any of the included programs such as MS word or MS excel. you can install software form a CD or DVD, an external hard drive, or from a networked computer.you can also install a program or software update form a file downloaded from the internet.
before installation it is wise to cred a restore point ( discussed later). this saves important computer from damage in the event of computer breakdown. installing a software program writes the necessary data for running the program on your hard drive. installing software is usually a simple process. it involves double-clicking an installer icon and then clicking "I Agree" when the license agreement appears on screen.
you may have to choose what

directory on your hard disk you would like to install the software in, but often the installer will even choose that for you.
windows vista, the latest OS by Microsoft windows, is also a system software that is installed before use. like many software's, it comes in edition. they are business, home basic, home premium, and ultimate.
UNINSTALLING SOFTWARE'S:
if a software program or game is no longer being used or additional space is required, it may be necessary to uninstall it. remember, uninstall is different from deleting a file / folder. there are software that are simply deleted if their removal is necessary, but they are few. ( the Urdu typing software in-page is an example.) most software have to be uninstalled. file have to be removed not just from the parent folder, but also from other places.
there are utilities in Microsoft windows that allow you to efficiently uninstall software's. in MS windows XP and versions before it, this utility was called " Add or remove programs". in MS windows Vista, it is called "program and features".
the instructions given below, to uninstall software, are for MS windows XP.
1. Click start, click control panel, and then double-click add or remove programs.
2. in the currently installed programs box, click the program that you want to remove, and then click remove.
3. if you are prompted to confirm the removal of te program, click yes.