Computer viruses or other similar programs tend to spread from one computer to another. They are designed to invade your computer for connecting to other computers, and further spread.
Here are some ways in which viruses can infiltrate your PC:
1. Boot viruses.
Each disk (hard disk, floppy, CD, DVD) contains the boot sector, regardless it is the boot disk or not. When the computer is switched on, it reads the boot information. If the computer detects a bootable disk with the information it reads it and applies for the correct boot. If for any reason the boot information is infected with the virus, the virus immediately activates and penetrates to the hard drive (if the virus was on the CD).
Most of these viruses may be present in the computer for a long time while not causing any harm, but existing only for distribution. Very often such viruses are programmed to activate at a certain time (eg, Halloween). But there are less peaceable viruses that can destroy the boot information or cause the formatting of the hard disk immediately after getting on your computer.
2. Infectious program.
When an infected attachment is running, the virus is activated and loaded into computer memory. While the virus is in memory, every application you run will be immediately infected. This means that the number of infected applications increase dramatically on your computer. The mass poisoning is fatal and immediately causes many problems with the system.
Infected files will be able to work without problems, but after some time problems still arise, or it just as soon lead to the destruction of the entire system.
Viruses of this type are designed to reduce the work programs for the exchange of information between users / computers, such as:
- Applications for e-mail;
- Screensaver;
- General office documents;
- Self-extracting compressed files.
3. Viruses that penetrate via email.
The most of dangerous viruses can basically get on your computer by e-mail as a file attachment to e-mail message. In such cases, the user of the infected computer not knowing attaches the infected files to e-mail message and sends it to a friend or colleague. Receiving a letter, a virus is activated immediately after opening the attached file, thus a new computer is infected.
E-mail messages with attached files:
- Animation
- Greeting cards;
- Jokes;
- Photographs;
- Spreadsheets;
- Documents likely contain the virus.
More and more viruses currently are spreading via email. Infiltrating, they will automatically scan your computer for any e-mail address and then sent to this address infected email.
It is therefore important to know all about the emails that you open on order to avoid contamination by harmful viruses. Even messages from family members and friends may contain viruses if the computer of this person is infected. In this case, only anti-virus program can help you; it will scan messages for viruses.
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