The Blue Screen of Death "is an infamous error screen more closely associated with Microsoft Windows. Some nerd humor sites collect examples of the famous Blue Screen of Death, as error screens that appear on the monitor, which are designed to display information for arrival and departure airports. As a general rule, we do not like to view the Blue Screen of Death in the wild, as it is an indicator of a critical system error.

The most distinctive feature of the Blue Screen of Death is, as you might imagine, the blue color of the background used. Anyone who has seen a Blue Screen of Death can instantly evoke the unforgettable striking blue background, white lettering that compensates used to display information about what caused the system failure that led to the Blue Screen of Death. This error occurs only when the computer is forced to shut down to protect itself from a critical error, and is usually accompanied by loss of data, unless you happened to save right before the error occurred.

A computer can automatically close after displaying the Blue Screen of Death, or the user may be forced to shut it down manually. After the arrest is complete, restart your computer normally and the computer can run diagnostics to determine what caused the fatal error and recover as much data as possible. If the Blue Screen of Death appears multiple times, can be an indicator of a very serious problem, and you may need to reinstall your operating system or go into so-called "Safe Mode" to address the problem. Safe mode has a stripped down version of the operating system that allows the user to solve problems.

For people who are not computer programmers, the information displayed on the blue screen of death may seem confusing. In reality, information is extremely useful because it matches the error number, the parameters of the 'error, and offers an assortment of other information that could be used to find the problem and prevent it from happening again. Programmers can use Blue Screen of Death information to quickly identify the root cause of the problem, if it's a hardware problem or a problem with the software kernel.

Many Windows users have seen the Blue Screen of Death at one point or another, particularly people who have used unstable builds of Windows or heavily modified their operating systems. Users of other operating systems, Windows users sometimes pretend with the specter of the Blue Screen of Death, suggesting that their operating systems are much more stable and less prone to errors.

Whenever i log into system i feel very irritated because of the alert message in system tray .Then i came to get the solution .We just have to do some simple steps.

1. First Step , Click the Start Button in the Left most of your Computer.
2. Second Step , Click the Settings and Click the "Control panel".
3. Third Step , There will be screen which have many icons regarding your System .
4. Fourth Step , In that you have to click the "Security Center" .
5. Fifth Step , Again another screen will open in that left hand side , you can see Menu name as "Resources".
6. Sixth Step ,  In that many option will be seen, Click the "Change the way Security Center alerts me" .
7. Seventh Step , Another Dialog Box Will Appear with three option.

• Firewall
• Automatic Updates
• Virus Protection

Make sure by un-marking the Check Box of all the option .

Hereafter you won't be irritated by the alert in the system tray.

A hard disk or drive is the part of your computer responsible for long-term storage of information. Unlike volatile memory (often referred to as RAM) which loses its stored information once its power supply is off, a hard disk stores information permanently, allowing you to save programs, files, and other data. Hard disks also have much greater storage capacities than RAM; in fact, current hard disks may contain over TB of storage space.

Basic components of a Hard Disk

A hard disk is comprised of four basic parts: platters, a spindle, read/write heads, and integrated electronics.

>Platters are rigid disks made of metal or plastic. Both sides of each platter are covered with a thin layer of iron oxide or other magnetizable material.

>Spindle - The platters are mounted on a central axle or spindle, which rotates all the platters at the same speed.

>Read/write heads are mounted on arms that extend over both top and bottom surfaces of each disk. There is at least one read/write head for each side of each platter.                                  The arms jointly move back and forth between the platters’ centers and outside edges; this movement, along with the platters’ rotation, allow the read/write heads to                                  access all areas of the platters.

>The integrated electronics translate commands from the computer and move the read/write heads to specific areas of the platters, thus reading and/or writing the needed data.

Computers

The fastest computers can do billion of calculation every second. Their main ability is to do a lot of basic tasks quickly and accurately.

The English mathematician Charles Babbage (1792 -1871) designed a large calculating machine which, in theory, could be programmed, like a computer. But the electronic age had not yet dawned, and there was no way to give Babbage’s Analytical Engine the power it needed.

Computer is one of the cleverest machines invented by man. Have you ever wondered what a computer looks like on the inside? There are thousands of tiny switches inside a computer. They are like light switches. By switching them on or off in different combinations, a computer can do anything. Fifty years ago, the first computers were large enough to fill a room. Now, they are much smaller and are also easy to carry or move.

The instructions and programs a computer uses are called the software.

The mechanical and electronic parts of a computer are called the hardware.

Sony developed the compact disc (CD) in 1979, in Japan and Philips did the same in The Netherlands.

Philips made the video disc in The Netherlands in 1972.

The world’s first personal computer, called Apple II, was made in 1977.

Nowadays, computers have tiny microprocessors (a circuit containing all the function of a computer’s central processing unit) in them.

Internet

Internet is the biggest network of computers in the world. It is a technology which connects millions of computers across the world by means of cables, telephone wires or some wireless media of communication. The computers connected to the internet can easily access the information available on other computers. They can also be used to send and receive messages.

Useful of internet

Internet is very useful for everyone. It provides a lot of information on almost every topic. Some of its uses are:

a) You can search information nearly on any topic.

b) You can send and receive messages using the e-mail facility.

c) Internet is the biggest and the cheapest medium for advertising products and services.

d) Interne is used to purchase various item.

e) Internet is the best medium to communicate instantly with people sitting at far off places.

f) Most newspapers and TV channels have their website on the internet which provides latest news.

g) Internet also provides a wide collection of songs and movies.

h) You can use internet to play games online with different persons/players sitting in different parts of the world.

Computer net work

You can talk to your friend without meeting him by using a telephone or a mobile phone. For this, you simply make a call to your friend by dialing his phone number and listening to the ring. When the ring goes, he picks up the phone and you talk to him. It means you have connected your phone to his phone. Now you can talk or communicate with him.

Talking to your friend using a telephone means that you have used a communication network. In this case, it is called telephone network.

In the same way, we can connect two or more computers with each other. These computers are connected through telephone wires or cables. This connection is known as computer network.

E-mails

E-mails are the way to send messages to family, friends and offices.

World Wide Web (www)

World Wide Web is the largest collection of information on the internet.

Website

A website is a collection of related web pages which provides information about a person, business organization, educational institute, etc; a website is like a book which contains many pages.

Web page

A web page is just like a page of your book. It is a one of the part of a website.

We browser

We get information from different websites.