I am incredibly frustrated with this BIOS virus. Please help! When I insert a disk that is bootable, the virus writes to the disk -- I believe to the MBR. I finally figured out that this is a virus after I lost three computers!!! I initially thought that I was having hardware issues so I replaced drives and tried to re-image the drive. Every time I attached a bootable drive, the BIOS "lost" it. In other words, the BIOS would see the drive unless it was bootable. As soon as I attached a bootable drive, it would lock up as Windows was installing. Then, when I rebooted it, the BIOS would not be able see it. I bought a new power supply and new disks. I moved cables around and I finally figured out that it is a virus. Now, here is the problem. If I clear the CMOS using the jumper and disconnect all drives except the CD-RW, the BIOS recognizes the CD with no problems and the installation or system repair disks boot up. HOWEVER, if I plug in an infected drive and turn on the computer, the computer locks up because the virus on the drive is trying to write to the BIOS. I locked the BIOS with a password, so the computer locks up now as the virus tries to rewrite my BIOS. I do not want to throw away six (6) hard drives since a couple of them are terabyte drives. More importantly, I do not want to throw away my USB drive since it has my backup data. I thought I was being smart by keeping a backup on this USB drive. All of these drives have touched the infected systems so I am scared of spreading this virus and losing more hard drives. How do I kill a BIOS virus that writes to the MBR of a hard drive? Every time the hard drive is attached to a computer, the virus is spread BEFORE the OS can turn on to run AntiVirus software. If McAfee is on a bootable CD, the CD boots AS LONG AS THE INFECTED HARD DRIVE IS NOT ATTACHED. However, if I plug in one of the infected hard drives, the virus runs as the hard drive is being recognized by the BIOS and the virus disables all drives that are bootable, including the bootable CD with McAfee. I can clear my CMOS with a jumper, but I cannot find a way to clear the MBR of a hard drive. Help!