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What is a computer virus?
A computer virus is a program or piece of code that is loaded onto computer without your knowledge and runs against your wishes.
A virus might corrupt or delete data on your computer, use your e-mail program to spread itself to other computers, or even erase everything on your hard disk.
Viruses can be disguised as attachments of funny images, greeting cards, or audio and video files.
Viruses are most easily spread by attachments in e-mail messages or instant messaging messages. That is why it is essential that you never open e-mail attachments unless you know who it's from and you are expecting it.
Viruses also spread through downloads on the Internet. They can be hidden in illicit software or other files or programs you might download.
Types of Viruses
1 Boot sector viruses
2. Program viruses
3. Macro
What Should I do if I have a Virus?
Clean your computer with anti-virus software. If your computer is still not functioning and you have data you are concerned about recovering, consider hiring a trusted expert. Often data can be successfully extracted from an injured hard drive, but the process is complex and will involve another computer, special software, and a technician with a lot of experience in data recovery.
What is an Anti-Virus?
Antivirus software is a class of program that searches a hard drive and floppy disk for any known or potential viruses.
Antivirus program runs in the Random Accesses Memory of a computer.
Anti-virus software typically uses two different techniques to accomplish this:
Examining files to look for known viruses by means of a virus dictionary.
Identifying suspicious behavior from any computer program which might indicate infection. Most commercial anti-virus software uses both of these approaches, with an emphasis on the virus dictionary approach.
Anti-virus is a software (computer program) that scans files or your computer's memory for certain patterns that may indicate an infection. The patterns it looks for are based on the signatures, or fingerprints, of known viruses. Once a virus is detected in the wild, the Anti-Virus companies then release these new patterns for your Anti-virus software to use. These updates come out daily by some vendors. Virus authors are continually releasing new and updated viruses, so it is important that you have the latest definitions installed on your computer.
Once you have installed an anti-virus package, you should scan your entire computer periodically. Always leave your Anti-virus software running so it can provide constant protection.
Automatic scans- Depending what software you choose, you may be able to configure it to automatically scan specific files or directories and prompt you at set intervals to perform complete scans.
Manual scans- It is also a good idea to manually scan files you receive from an outside source before opening them.
This includes: Saving and scanning email attachments or web downloads rather than selecting the option to open them directly from the source. Scanning floppy disks, CDs, or DVDs for viruses before opening any of the files
There are different types of antivirus software for different computers
1. Some are designed for personal computers.
2. Some are for servers and others for enterprises
There are mainly two types of antivirus software: specific and generic
Types of Anti-virus product
Depending on the installation method of the Anti-Virus these can be in the following forms: On-Access, On-Demand, and hardware.
Depending on the way they fix viruses these can be in the following forms: Anti-Virus, Anti-spyware, and Anti-spam Applications.