The reason that viruses are constantly floating around the Internet is their ability to replicate themselves. They can make copies of themselves in various types of data files. A virus may start harming your computer the moment that the file that it has corrupted is executed. This can cause serious damage to your computer although other viruses can be just a nuisance and bug you more than anything else. There are a few different types of viruses and it's important for you to know which ones are which.
Firstly there are memory-resident viruses. This type of virus is not looking for other hosts to infect once it in executed. A memory-resident virus waits until the computer user opens files so that they can corrupt them. They can replicate themselves but do not possess the ability to find other hosts.
A non-memory resident is worse again, along with being able to replicate itself, it also has a finder module for other hosts. Once executed within your system it will instantly start looking for other hosts to infect. While the replication module is corrupting files, the finder module is searching for more files to corrupt. When it finds files to infect, it instructs the replication module to do so. Once your application programs are infected, the non-memory resident virus has control of those programs.
The most common type of virus in the 90s was the boot virus. This was possible because the use of floppy disks was so popular. Once executed a boot virus corrupts the boot sector or the master boot record (MBR) of a hard-disk. Once it has infected one of these, it can be tough to remove. It continues this cycle by infecting any future disks that are read by the computer. Most anti-virus programs can sort out a problem in the master boot record. To remove one of these viruses from your computer you need to obtain bootable anti-virus disks, which will remove boot sector viruses quickly and easily.
The most common type of viruses now are file viruses. Once in your system they infect program libraries on your computer. This virus is sneaky because when it enters a host file, it modifies it to make sure that the next time the file is executed that the viruses is launched. File viruses have been known to corrupt the executables of standard DOS, OS/2, Windows and Unix.
Script viruses are like file viruses but are written in the languages used on the net like HTML, PHP and JavaScript etc. A script virus however may only be a small part of a larger virus. They can infect quite a few different parts of your system as they corrupt any file that allows the execution of scripts.
And finally, Macro viruses use the macro's within the applications on your computer to replicate themselves on your system. Macros are commonly used in word processing programs; macros make recurring tasks easier or automatic. These forms of viruses can often spread via e-mail and damage the document. They do not however cause as much damage as many of the other viruses discussed here.
Firstly there are memory-resident viruses. This type of virus is not looking for other hosts to infect once it in executed. A memory-resident virus waits until the computer user opens files so that they can corrupt them. They can replicate themselves but do not possess the ability to find other hosts.
A non-memory resident is worse again, along with being able to replicate itself, it also has a finder module for other hosts. Once executed within your system it will instantly start looking for other hosts to infect. While the replication module is corrupting files, the finder module is searching for more files to corrupt. When it finds files to infect, it instructs the replication module to do so. Once your application programs are infected, the non-memory resident virus has control of those programs.
The most common type of virus in the 90s was the boot virus. This was possible because the use of floppy disks was so popular. Once executed a boot virus corrupts the boot sector or the master boot record (MBR) of a hard-disk. Once it has infected one of these, it can be tough to remove. It continues this cycle by infecting any future disks that are read by the computer. Most anti-virus programs can sort out a problem in the master boot record. To remove one of these viruses from your computer you need to obtain bootable anti-virus disks, which will remove boot sector viruses quickly and easily.
The most common type of viruses now are file viruses. Once in your system they infect program libraries on your computer. This virus is sneaky because when it enters a host file, it modifies it to make sure that the next time the file is executed that the viruses is launched. File viruses have been known to corrupt the executables of standard DOS, OS/2, Windows and Unix.
Script viruses are like file viruses but are written in the languages used on the net like HTML, PHP and JavaScript etc. A script virus however may only be a small part of a larger virus. They can infect quite a few different parts of your system as they corrupt any file that allows the execution of scripts.
And finally, Macro viruses use the macro's within the applications on your computer to replicate themselves on your system. Macros are commonly used in word processing programs; macros make recurring tasks easier or automatic. These forms of viruses can often spread via e-mail and damage the document. They do not however cause as much damage as many of the other viruses discussed here.
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