BIOS Update for windows 2000 SP3

My Windows XP 2003 Dark Edition has been corrupted recently due to a power failure experienced by my PC. And, I was unsuccessful, as I tried to reinstall the Windows XP (Dark and Original both) later after the corruption.
Hence, I installed Windows 2000 service pack3 and attempted to install Win XP 2003 again, and I found an error message where I was asked to update the BIOS. Please someone help me by telling me the way to update my BIOS for Windows 2000 SP3. I will be thankful to you.
