Windows Legacy OS forum

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Boot Sector Virus

by pebo94 / February 7, 2006 9:14 PM PST

I am doing a clean reinstallment of win98 on the same computer due to virus but at "Do you wish to use maximum available size for primary dos partion etc" i got a flashing warning about virus saying "Boot sector write, virus. continue (Y/N)?
At this stage how do you remove this virus when i already clean and format the disk. this error showed up during formating as well but i chose to continue thinking after installation is complete i could then attack the virus. i was unable to load win 98.
System is EMACHINE, WIN98,4GHD and 60mb

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That can be proper.
by R. Proffitt Forum moderator / February 7, 2006 9:38 PM PST
In reply to: Boot Sector Virus

When the BIOS Virus Protection is enabled, this will happen. Answer Yes to be able to write the sector.


Bob

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No problem.
by Kees Bakker / February 7, 2006 11:01 PM PST
In reply to: Boot Sector Virus

Pebo,

Most BIOS-es offer protection for the boot-record, warning you to accept or decline changes. It's an anti-virus measure indeed. In this case, it's not a virus but you yourself that writes to the boot sector, so it's safe to accept it. Or you can turn off boot-sector protection in the BIOS temporarily to get rid of the message.

This seems like something you do with FDISK. It's not necessary to delete and build partitions for a clean reinstall. Format c: is more than enough cleaning. Even less (delete of c:\windows and c:\program files) suffices. But if you decide to run FDISK for partitioning you'll get this warning.

It's unusual this error comes while formatting. And it's no explanation at all that you can't load Windows 98.

Tell more?

Kees

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MBR and FDISK
by Cursorcowboy / February 8, 2006 11:35 PM PST
In reply to: Boot Sector Virus
At this stage how do you remove this virus when i already clean and format the disk. this error showed up during formating as well but i chose to continue thinking after installation is complete i could then attack the virus.

Could happen...as the first two members explain...but as Kees mentions, it seems unnatural during the actual formatting, I think.

However, let me make a statement since you mentioned "Boot Sector Virus":

The article [Q69013] states that at the end of the ROM BIOS bootstrap routine, the BIOS reads and executes the first physical sector of the first floppy or hard disk on the system called the master boot record (MBR) [or sometimes the partition table or master boot block]. There is a small program at the beginning of this sector of the hard disk where partition information, or partition table, is stored and uses the partition information to determine which partition is bootable (usually the first primary DOS partition) and attempts to boot from it. This program is written to the disk by the FDISK command during typical operation only if there is no previous MBR.

a. Repartitioning with Fdisk does not rewrite the MBR.

b. Fdisk has an undocumented parameter called /mbr that causes it to write the MBR without altering the partition table information.

WARNING: However, writing the MBR to the hard disk in this manner can make certain hard disks partitioned with SpeedStor unusable. It can also cause problems for some dual-boot programs and disks with more than four partitions.
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(NT) (NT) Thanks to all
by pebo94 / February 10, 2006 12:56 PM PST
In reply to: MBR and FDISK
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(NT) Thanks to all
by pebo94 / February 10, 2006 12:56 PM PST
In reply to: MBR and FDISK

Thanks to all

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Thanks to all
by pebo94 / February 10, 2006 12:56 PM PST
In reply to: MBR and FDISK

Thanks to all

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