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Answer:
The virus replaces the default program with its own corrupted version. A boot sector virus is able to infect a computer only if the virus is used to boot up the computer. The computer will not be infected if the virus is introduced after the boot-up process or when the computer is running the OS.
Answer:
Boot sector viruses infect the boot sector or the partition table of a disk. Computer systems are typically infected by these viruses when started with infected floppy disks - the boot attempt does not have to be successful for the virus to infect the computer hard drive. A file-infecting virus is a type of malware that infects executable files with the intent to cause permanent damaxge or make them unusable. ... This type of virus can infect a number of operating systems, including Macintosh, Windows and Unix. A file-infecting virus may also be known as a file injector.