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Computer viruses are software
programs that spread between computers and interfere with computer operations.
Computer viruses have the potential to corrupt or even destroy computer data,
use your email account to transmit the virus from your computer to those of
your email contacts and erase the entire contents of your hard disk drive.
Computer viruses tend to be spread through messages sent over instant messaging programs and through attachments contained within email messages. Computer viruses may also be spread through Internet downloads. They can be contained within downloads of all types, including pirated software (software that has been copied and passed on without authorisation). For this reason, you must take care not to open email attachments from untrusted sources and download programs from lesser known websites.
There are many different types of computer viruses, including:
Resident Viruses
Resident viruses affect your computer's Random Access Memory (RAM). They corrupt (make changes to) the files and programs present on your computer system.
Boot Viruses
Boot viruses affect a part of your computer's hard disk drive known as the boot sector. The boot sector contains the information necessary to start up (boot up) your computer. Hence, computers affected by this virus may not start up as they should do.
Direct Action Viruses
Direct action viruses replicate themselves and infect the files in your computer's directory. They function whenever your computer is started up.
Directory Viruses
Directory viruses change the pathways your computer needs to go down to access files. When you open up the affected files, you will be running the virus without being aware of it.
Overwrite Viruses
Overwrite viruses delete information contained within the files that they infect, rendering the files useless. These viruses can only be eliminated by deleting the infected files.
File Infectors
File infectors are the most common computer viruses. These viruses infect programs and executable files (files that tell your computer to carry out tasks in accordance with the instructions contained within them). These viruses find their way onto your computer through certain types of freeware (free programs) that you may have downloaded from the Internet.
Companion Viruses
Companion viruses accompany the files that already exist on your computer. They target files that are regularly used, such as those involved in starting up your operating system. Some companion viruses disguise their presence by allowing you to open the file that they accompany as normal. However, the viruses will be functioning alongside the file.
FAT Viruses
FAT is an acronym for File Allocation Table, a piece of software that enables your operating system to interact with the hard disk drive and vice versa. When FAT viruses infect your computer, information can become lost. This is because the FAT system is essential to the storage and retrieval of data placed on the hard disk drive. In the worst case scenario, your hard disk drive may not work as it should do.
The threats presented by these computer viruses render the use of anti-virus software essential. Your computer may have come with anti-virus software installed. However, if it did not, you will need to purchase and install this software yourself. Anti-virus software will prevent viruses from infecting your system and will detect and destroy any viruses that have already infected your system.
Computer viruses tend to be spread through messages sent over instant messaging programs and through attachments contained within email messages. Computer viruses may also be spread through Internet downloads. They can be contained within downloads of all types, including pirated software (software that has been copied and passed on without authorisation). For this reason, you must take care not to open email attachments from untrusted sources and download programs from lesser known websites.
There are many different types of computer viruses, including:
Resident Viruses
Resident viruses affect your computer's Random Access Memory (RAM). They corrupt (make changes to) the files and programs present on your computer system.
Boot Viruses
Boot viruses affect a part of your computer's hard disk drive known as the boot sector. The boot sector contains the information necessary to start up (boot up) your computer. Hence, computers affected by this virus may not start up as they should do.
Direct Action Viruses
Direct action viruses replicate themselves and infect the files in your computer's directory. They function whenever your computer is started up.
Directory Viruses
Directory viruses change the pathways your computer needs to go down to access files. When you open up the affected files, you will be running the virus without being aware of it.
Overwrite Viruses
Overwrite viruses delete information contained within the files that they infect, rendering the files useless. These viruses can only be eliminated by deleting the infected files.
File Infectors
File infectors are the most common computer viruses. These viruses infect programs and executable files (files that tell your computer to carry out tasks in accordance with the instructions contained within them). These viruses find their way onto your computer through certain types of freeware (free programs) that you may have downloaded from the Internet.
Companion Viruses
Companion viruses accompany the files that already exist on your computer. They target files that are regularly used, such as those involved in starting up your operating system. Some companion viruses disguise their presence by allowing you to open the file that they accompany as normal. However, the viruses will be functioning alongside the file.
FAT Viruses
FAT is an acronym for File Allocation Table, a piece of software that enables your operating system to interact with the hard disk drive and vice versa. When FAT viruses infect your computer, information can become lost. This is because the FAT system is essential to the storage and retrieval of data placed on the hard disk drive. In the worst case scenario, your hard disk drive may not work as it should do.
The threats presented by these computer viruses render the use of anti-virus software essential. Your computer may have come with anti-virus software installed. However, if it did not, you will need to purchase and install this software yourself. Anti-virus software will prevent viruses from infecting your system and will detect and destroy any viruses that have already infected your system.
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