computer mouse
Article
What Is Virus?
By uCertify
Viruses infect existing programs to alter the behavior of programs, actively destroy data, and perform actions on storage devices that render their stored data inaccessible.
Computer viruses attack the software of a such as operating systems, data files, application software, and e-mails. However, viruses do not affect the hardware.
Viruses infect computers and spread themselves using various methods. Some viruses attach themselves to a common program such as a popular game or word processor. When a person downloads the infected game and runs it, the attached virus program gets executed. The virus then loads itself into memory and searches for any other program on the disk. If the virus finds any program, it modifies the program by adding the malicious code to the program. The next time this program gets executed, it infects other programs, and the cycle continues thereafter.
There are many types of viruses such as a boot-sector virus, macro virus, e-mail virus, etc.
A boot-sector virus infects the boot record on hard disks and floppy disks, which is used to start the computer. When the is turned on or restarted, the virus is automatically executed. An infected boot disk may stop the from starting up.
A macro virus is a macro or script that attaches itself to a file or template. When the file is loaded, the instructions of the macro or script are executed.
An e-mail virus moves around in e-mail messages, and usually replicates itself by automatically mailing itself to many people in the their e-mail address book.
Some other types of programs are also harmful to computers, which are not viruses such as a Trojan horse.
The main difference between a virus and a Trojan horse program is that a Trojan horse program does not replicate itself. A Trojan horse only destroys information on the hard disk. A Trojan horse program disguises itself as a legitimate program such as a game or utility. It often looks and initially acts in the same way as a legitimate program, but when it is executed,
Cisco Linksys E4200 v2 Maximum Performance Dual-Band N900 router
The Linksys E4200 v2 makes a great upgrade to the original version and an...
HP Folio 13
When it comes to Windows ultrabooks, the HP Folio 13 is the best of the...
Netgear WNDR3800 N600 Wireless Dual-Band Gigabit Router - Premium Edition
The Netgear WNDR3800 N600 Wireless Dual-Band Gigabit Router makes an...
it destroys or corrupts data. A Trojan horse program can contain viruses, but it is not a virus itself.
A Worm uses networks and security holes to replicate itself. A Worm scans the network for another that has a specific security hole. It copies itself to the new using the security hole, and then starts replicating from there as well. A virus can have both virus and worm characteristics.
There are several anti-virus software that can detect, identify, and remove these viruses. As a precaution against viruses, we should take the following actions:
An anti-virus software that can detect, identify, and remove viruses should be installed on the computer.
All information downloaded from the Internet or some unknown resource must be immediately scanned for viruses by using an anti-virus software.
Any e-mail attachment that comes from unknown sources should never be opened.Article Source: http://www.ArticleJoe.com About the Author:uCertify was formed in 1996 with an aim to offer high quality educational training software and services in the field of information technology to its customers. uCertify provides exam preparation solutions for the certification exams of Microsoft, CIW, CompTIA, Oracle, Sun and other leading IT vendors. To know more about uCertify, please visit www.ucertify.com/
We strive to provide only quality articles, so if
there is a specific topic related to computer that you would
like us to cover, please contact us at any time.
And again, thank you to those contributing daily
to our computer mouse website.
| Latest
News on computer mouse |
5 Reasons To Purchase Desktop Computers
By Aurel Radulescu
If you are in the market for a computer, there are a number of factors to consider. Will it be used for your home, your office or perhaps even your home office combo? First off, you will need to set Read more...
|
|
Computer Accessories | Connectors | Flash Products | Switch Boxes | Adapters | Pc Cables Desc – Get
able border=0 cellpadding=0 cellspacing=0 align=center bgcolor=000000 Read more...
|
Epson WorkForce 845 All-in-One Printer
Though it's slightly more expensive than competing inkjet workhorses, we...
Samsung Series 7 (15-inch)
Samsung's Series 7 Chronos 700Z5A-S03 is the closest Windows equivalent to a...
HP Officejet Pro 8600 Plus e-All-in-One Printer
|
