Viruses can infect a number of different portions of the computer's operating and file system. These include:
System Sector VirusesThese infect control information on the disk itself.
File VirusesThese infect program (COM and EXE) files.
Macro VirusesThese infect files you might think of as data files. But, because they contain macro programs they can be infected.
Companion VirusesA special type that adds files that run first to your disk.
Cluster VirusesA special type that infects through the disk directory.
Batch File VirusesThese use text batch files to infect.
Source Code VirusesThese add code to actual program source code.
Visual Basic WormsThese worms use the Visual Basic language to control the computer and perform tasks.
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