What changes my boot block?

[Albert Graham]

Jochen Wiedmann wrote:
> Hi,
>
> I am running a dual boot system with Windows on sda1 and Fedora 8
> Linux on sda3 since quite some time. I am using the standard MBR, Grub
> is installed on the active partition, sda3.
>
> Recently I noticed that my boot block was defect. There was a possible
> reason why this could happen (upgrade of PGP WDE on Windows), so I
> wasn't overly surprised. No problem, grab the rescue CD reinstalled
> Grub and the system was up again. Windows and Linux were bootable
> again.
>
> Except that, after I worked the next time on Linux (meaning: the next
> time I did more than simply booting up and shutting down) the same
> thing happened again. Ok, reinstalled Grub, checked that Windows and
> Linux are bootable again and so far so good.
>
> But finally, after actually working with Linux again today, I found
> myself confronted with a blank screen with the word GRUB in the upper
> left corner again: Third time destroyed boot system in a row.
>
> Any ideas what's happening?
>
>
> Thanks,
>
> Jochen
>   

This is a Virus, most likely called "windows" :)

Has your BIOS got a boot block write protection feature ?


Al.