boot sector virus
Boot virus
A multipartite virus is a combination of a boot sector virus and a file virus. It can hide in either type of program.
A boot sector virus is a computer virus that puts itself in the boot sector of a computer. The boot sector is the partition on the disk drive that contains all of the programs and files necessary for the computer to start up. This ensures that the virus will be executed once the computer is turned on.
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Boot Sector Virus
Fixing a boot up structure that is corrupted due to a virus can be difficult to deal with depending on the extent of the damage done. Reformatting the hard will can fix the boot up structure. If the virus destroys the Master Boot Record then the hard drive is useless paper weight.
Boot sector virus
A computer virus is a malware program that, when executed, replicates by inserting copies of itself (possibly modified) into other computerprograms, data files, or the boot sector of the hard drive; when this replication succeeds, the affected areas are then said to be "infected".Virus - Vital Information Resources Under Seize
multipartite virus
first boot into safe mode then download malware bytes antimalware then scan and remove the viruses and then boot into normal mode
If a virus persists on a PC even after formatting it is likely that the virus has been inserted into the boot sector of the hard drive - which is not rewritten when you re-format it. Assuming you are running a Microsoft OS, to fix it, boot using the install CD for the OS and run the first Repair option which will load the Recovery Console from a ramdisk (and doesn't use the hard drive for booting). This requires that your BIOS supports booting from the CD drive. Then run the 'fixboot' command. This is supposed to overwrite the boot sector. You may have to specify the drive letter of which partition to fix.
Virus protection programs can prevent many viruses or commands from happening on the boot area of the hard drive if it feels it can cause harm. In order to allow commands despite the virus protection program go into computer settings and programs then disable the anti virus program software. This can cause harm to your hard drive.