There are only three ways you can get a virus

　　What is a virus? A virus is the name for a parasitic program written to intentionally enter a computer without the Ventilation Ceiling Fan For Office user's permission or knowledge. The word parasitic is used because a virus attaches to files or boot sectors and replicates itself so it can spread. Though some viruses do little more than copy themselves, others can cause serious damage or affect program and system performance. Therefore a virus should never be assumed harmless or left on a system. 2. One way you can’t get a virusYou cannot get a virus simply by being on the inteet or using an online service. You will only become infected via the inteet if you download an infected file and then run that file.

3. Three ways you can get a virus There are only three ways you can get a virus: i) by executing an infected program ii) booting from an infected diskette iii) opening an infected email attachment. Strictly speaking i) and iii) are pretty much the same, but most people think of them quite differently, so I will too. 4. What are infected program viruses?Infected program viruses are often attached to other software programs like games, disk utilities, the macros in office documents and screen-savers. They are activated when these normally harmless programs are started. When the infected application is run the virus activates and loads into memory, where it can infect any new program that you open. This means that ever more applications on your system will become infected, which will almost certainly cause system problems.

Files downloaded directly from the Inteet (either through file-sharing programs or direct download from websites), are among the fastest growing sources of computer virus infections. 5. What is a boot infector?Booting from an infected disk simply means allowing your computer to start up with a disc, CD or DVD in the drive. Even so called ‘non bootable’ diskettes, CD's, and DVD's can be infected by a boot sector virus, so make a point of removing all kinds of discs when you’ve finished with them. Once the ‘boot code’ on your hard drive is infected, the virus will be loaded into your computer’s memory every time you start your computer, from where the virus can infect each and every disk that is put into your computer.