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