The system would try to boot to a nonexistent copy of System Commander. However, I decided to remove an operating system from a computer, and System Commander was damaged in the process.Īfter the damage occurred, the system was unbootable. The program then displays a menu and allows you to boot to a variety of operating systems. System Commander alters the boot sector so that your system will boot the System Commander program instead of the normal operating system. For example, I was recently using a program called System Commander from VCOM. Likewise, legitimate programs can also cause boot problems similar to that of a virus.
HOW TO REMOVE A MBR VIRUS CODE
Unfortunately, some viruses don’t back up the boot sector code before altering it. It then removes the viral code and moves the boot sector code back to the correct location. When you remove a boot sector virus, the antivirus program is usually smart enough to know where the original boot sector was copied to. Most (but not all) viruses that infect the MBR do so by copying the contents of the boot sector to a different file and then overwriting the boot sector with viral code. When the system is powered up, the hardware knows to look at the MBR, and then the MBR redirects the system to the boot sector so that the boot process can begin. Normally, the MBR points at a system’s boot sector. Sure, you can usually disinfect the system, and it will begin booting normally–but what do you do if a system still won’t boot after a virus has been removed? To answer that question, it’s necessary to take a closer look at how this particular type of virus works. Unfortunately, many viruses are designed to attack a system’s MBR. Without a valid MBR, it’s impossible to boot the system from the hard disk. One of the most important parts of your system’s hard disk is the Master Boot Record (MBR).
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