How to Fix a Boot Virus

A boot virus can be permanently removed by resetting your computer's basic input/output system.

A boot virus is a one that hides in the basic input/output system of your computer. The BIOS controls the most basic operations of the computer. It's main job is to load and start an operating system such as Windows or Linux when you turn on the computer. It also sets the date and time and tells the computer how much memory and hard drive space is available. Because the boot virus hides outside of the operating system, it reinfects the hard drive even after it has been removed using antivirus software. In order to permanently remove the boot virus you must reset the BIOS.

Instructions

1. Turn off and unplug the computer.

2. Open the computer case. Many computers have a side panel that can be removed by unscrewing some bolts at the back of the computer and then pulling the panel toward the back. On other computers the sides and top are all one piece and can be removed the same way.

3. 

   The CMOS battery looks like a large watch battery.

   Locate the CMOS battery on the motherboard. The motherboard is the large circuit board inside your computer. The CMOS battery looks like a nickle-size watch battery.

4. Remove the CMOS battery carefully so you do not damage the housing.

5. Wait at least 60 seconds. This will allow the BIOS to discharge and reset. Reinstall the battery. Be sure the poles are facing the correct direction.

6. Close the computer case. Plug the computer in. Turn it on.

7. Boot the computer to the BIOS by pushing the F2 key before the operating system starts.

8. Correct the date and time using the keyboard. When you removed the battery the date and time were reset to the day the BIOS was built. If you don't correct this, date sensitive programs like antivirus software and financial software will not work properly. Select save settings and reboot.

9. Perform an additional virus scan to ensure sure all viruses have been removed.

Tips & Warnings

• Static electricity can harm sensitive computer components. Be sure to discharge static electricity by touching metal before opening a computer case. Never repair computers while standing on carpet.

• To avoid electric shock, always turn off and unplug electronic equipment before doing maintenance.

References

• Ron Potvin; Owner and Technician, Technology Solutions, Inc.; Newport, Maine

Resources

• How to Remove a CMOS battery
• Microsoft: How to detect a boot-sector virus