I am trying to fix a friends PC. I have tried fdisk/mbr, formatted the HDD, deleted the primary partition then recreated the partition, formatted the HDD (again) then tried to install Win 98 se. It goes through its usual checks then gathers files to copy but when it reaches 100% a (DOS-like) pop up says: VIRUS! MASTER BOOT SECTOR WRITE. CONTINUE? Y/N. At this point it doesn't matter whether I press Y or N (or any key)as the PC freezes. I have tried this several times with the same result. There may be something I am missing or not doing in the right order as I have helped a friend in the past with the same problem but managed to fix that easily. The PC is very old - P100, 16Mb RAM, 2Mb grahics and 500Mb HDD. I recommended to my friend that he donated the PC to a museum but he was not impressed.