Virus Symptoms:

1- The computer is unable to boot or load its operating system.

2- The computer shuts down without reason.

3- The increase or decrease in the size of files without a clear reason.

4- Some files are cancelled without reason.

5- False and unexpected messages are received.

6- Strange letters appeared on pressing the keyboard.

7- The appearance of some strange figures.

8- The computer slows down in a noticeable way.

Ways of carrying computer viruses:

All types of Storing Media are considered the primary causes for spreading

the viruses of computer.

- Hard disks, CDs and Flash Memory

Causes of viruses:

- Dealing with the internet

- Downloading files.

- Receiving e-mails.

Virus and ways of protection:

You can protect your computer from virus through the following:

* Take the necessary protections precautions.

Use anti-Virus programmes to scan your computer. **

Remove all viruses quickly

* Protection is better than cure in dealing with viruses.

Precautions for protection:

- Use original copies

- Make spare copies from the original programmes and data files.

- Protect the CDs through CDs holes.

- Watch out the file sizes from now and then.

- Watch out the executive files.

- Use anti-virus programmes to scan your computer to detect and remove

the viruses.

Scan Virus programmes:

Anti –Virus programmes are used to scan the computer (Programmes, data

files and the stored media available on the set). These programmes have the

ability to detect viruses if they are found.

Notice

There are many anti-virus programmes but a single anti-virus

programme cannot detect all types of viruses .

We can use more than a programme

to detect viruses . We must update these

programmes using updated versions.

Virus protection:

- Every computer user should possess updated anti-virus programmes.

- The Booting CD should be virus free.

The most famous Anti - Virus programmes to detect viruses are:

* Norton

* Mcafee

Some Viruses names:

1- Michel Anglo Virus

2- Israeli Virus.

3- The extended Ball Virus

4- Birthday Card Virus.

5- Char noble Virus

6- Nighthorse virus

7- The middle Night Virus

Remember

Organic Virus definition:

The organic virus is the virus that can infect man and has the ability to

move, spread and reproduce .

Computer virus definition :

It is a little programme that has the ability to reproduce , spread and it

contains a number of orders that destroy or delete the programmes or the

data found in the computer .

Reasons for the appearance of computer Viruses:

1- Protecting the original programmes from copying by users in an

unauthorized way.

2- For trade, as some companies specialized in producing anti- virus

programmes.

3- The anti-virus programmes show the extent of intelligence of the

programme designers.

Virus properties:

Dormant- reproducing - moving- putting marks and signs

to carry out its own destructive orders.-

Places that the virus attacks:

Executing Files, System Files and Data files