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What Is Virus?
By uCertify
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 computer such as operating systems, data files, application software, and e-mails. However, viruses do not affect the computer 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 computer 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 computer is turned on or restarted, the virus is automatically executed. An infected boot disk may stop the computer 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
Trailer Hitches come in many styles - choose correctly for your needs
When searching for trailer hitch you will find that there are basically three things you need to know. Trailer hitches come is several styles so knowing the style you need will depend on your vehicle and what you want to tow.
Install Trailer Jacks to save your back - just start cranking!
If you have a trailer, one of the first accessories you will be looking for is trailer jacks. A good trailer jack will save your back from constantly lifting up the tongue of your trailer when connecting and disconnecting it.
Gooseneck Hitches can easily be mounted in your truck
For pulling horse trailers or large utility trailers, gooseneck hitches are usually the ticket. A gooseneck hitch usually mounts to the bed of your pickup, usually over the rear axle. This allows the load from the trailer to be dispersed at a location your truck will best be able to handle it.
From wiring harnesses to locks - lots of Trailer Hitch Accessories
There are several items such as locks or chains that are available as trailer hitch accessories. A trailer hitch accessory is not really an option in all situations - many times they are requirements for safe towing.
often looks and initially acts in the same way as a legitimate program, but when it is executed, it destroys or corrupts data. A Trojan horse program can contain viruses, but it is not a virus itself.
A Worm uses computer networks and security holes to replicate itself. A Worm scans the network for another computer that has a specific security hole. It copies itself to the new computer 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/
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