How to clean a BIOS virus

Written by james garret
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How to clean a BIOS virus
Cleaning a BIOS virus takes extra steps. (virus alert image by dead_account from

The BIOS, or basic input/output system, is built-in firmware that instructs the computer through the start-up process. A virus in the BIOS, more than a nuisance, can render your computer unusable. Cleaning a BIOS virus requires more than a virus scan or simple sweep of the hard drive.

Skill level:

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Things you need

  • Access to an uninfected computer
  • Access to the Internet
  • A floppy disk

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  1. 1

    Back up all of your important files. Save them to an external hard drive or burn them to a disk. Then shut down your computer. Use an uninfected computer to download the BIOS flash software. Flashing the BIOS will allow you to return the BIOS to its uninfected state. Download the appropriate BIOS flash software by going to the website of your motherboard or computer manufacturer and searching for your model number.

  2. 2

    Format your floppy disk by right-clicking on the disk icon and selecting "Format." Then check the box that says "Create an MS-DOS start-up disk.. Save the BIOS flash software to the disk. You have now created your boot disk.

  3. 3

    Disconnect the hard drive from your infected computer. Open your computer's case and either remove your hard drive completely, or unplug the cables from the back. Insert the floppy disk and start up your computer. Follow the prompts and set the BIOS to boot from your floppy disk. Restart the computer. Run the flash software on your floppy disk to restore the BIOS to its factory state..

  4. 4

    Turn off your computer, remove the floppy disk and reconnect your hard drive. Change the boot order in the BIOS so it boots from the hard drive again. Use the factory restore or Windows install disk to reinstall your Operating System. This ensures that the virus does not get to run again and reinfect your computer.

Tips and warnings

  • Keep your floppy boot disk in a safe place in case you ever encounter another infected BIOS.

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