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Another important choice is whether it will be new or second hand. In the latter, initially it is important to distinguish between three types of purchases:
• Shops specializing in secondhand goods.
There are shops specializing in the sale of computer equipment used in where you can find computers, printers, monitors, keyboards and even some printer cables. These companies usually offer a warranty that ranges from two to three months in their products.
• A computer stores or companies.
Many companies and computer stores sell their remaining stock of their computer display or used for a certain time. While giving assurance, the problem is in prices, generally high, especially in branded computers.
• A individuals.
Individuals are selling second hand risky. Sometimes computers and components are very abused, with errors of origin, with some hard drives damaged sectors, and many other aspects that will be difficult to distinguish with the naked eye. The prices are usually good, but the risk is high, since there is no guarantee in writing.

When you make your purchases of second hand we recommend:
• Not too afraid to ask questions and investigate, and that after making the purchase will be very difficult to achieve changes or repayment of money.
• Be wary of big deals.
• Investigate the status of the hard drive and ask that you allow to use a hard drive analyzed before you buy, you can use this to use the utility included in Windows SCANDISK call, and if possible bring a verifier Norton utilities, Chek-it or any other material that may store on a floppy disk.
• If distrust of the monitor do not buy it, check that the screen is not shredded and not blow this one because the monitors do not support coups, ask to see it in operation and make sure that does not make any noise and the image is properly appreciated. If possible ask for a guarantee of 3 months (very common in used computer stores).

And the laptops?
• These machines are designed primarily to facilitate his transfer, in its keyboard and screen size is what will make for a tired hands faster than if you use a normal size keyboard and eyes on the size and characteristics of the screen.
• The initial cost of acquisition of equipment and devices installed later is larger compared to the cost of desktop computers.
• The repair of such equipment is often unaffordable, and that most of the parts must be imported on request.
• Also available on the market what is called a PDA or handheld computer (a handheld computer, pocket). A PDA is a super-PDA, but with far superior functionality. At present there is the full keyboard, are used in an environment very similar to Windows and even have a Word, Excel and Internet Explorer versions in small, fully compatible with your desktop. However this type of equipment are also not recommended for family use for the reasons stated for the laptop.


Softwares

The components of your computer are considered in the computing hardware but also of all the computer equipment needed for programs known as software that will allow you to perform various tasks and their children, jobs or activities.

As in the choice of components and capabilities of your computer, the programs should be chosen on the basis of the needs of those who will use the computer.

First:
PCs require an operating system (usually Windows XP PC. Preference which should come in requesting the purchase of your computer. However, regularly creates new versions of operating systems, improving their ability and agility in the process. When they come into the market, it is important to investigate if the software already installed on your machine is compatible with the new version of operating system to acquire and if the computer equipment has the required minimum hardware requirements, and no problems in operation.

Later:
In most cases the computers that are purchased today include "packages" of programs that contain a word processor, spreadsheet, and graphics editor. This trio of programs will be the main tool for basic and allow their children to develop homework, presentations, covers, lists and simple calculations. If you buy a computer that does not include these programs will need to buy separately and choose the package that suits their personal and economic interests, some of the most common are Microsoft Office, among many others.

In the background:
They are the "specialized", they respond to specific needs such as design illustrations, edit images, voice and even perform calculations accounting and management statistics. To function optimally, they require the computer to cover certain technical requirements that must be verified before purchasing.

If you consider the possibility of any of these tasks, the specialized computer programs have different needs, and provide information on their strengths and limitations.

And of course the virus:
It is very important always to consider the purchase of a virus to your computer. In the world of computer viruses is known as a self-extracting programs containing harmful instructions: clear information to affect the hard drive, block a function of the operating system, and so on.

Antivirus programs are operating as vaccines to detect and eliminate the presence of such programs, preventing them from entering your machine when you insert a diskette, a ZIP or a CD, DVD or receive a file via the Internet.

It is worth mentioning that at present there are many different computer viruses that are increasing in number every day and the third party that are frankly harmful, why when you buy an antivirus software manufacturer gives you the right to get off the Internet during The following 12 or 24 months, the updates that are developing in response to new viruses that are still generating. Or in some cases not at all, repairing the damage when the virus has already been entered on your machine.

Some of the most commonly used anti-virus: Norton AntiVirus, McAffe to name a few.