Error 0251 System CMOS checksum bad: how do I fix it?

I DONT KNOW ELSE TO DO OPLSHELP ME!!!!
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More about error 0251 system cmos checksum
  1. Renew CMOS Battery?
  2. Remove the battery for 30 seconds.
    Otherwise reflash the bios with emergency procedures, bootable floppy or usb flash drive with autoexec.bat.
    Please see your motherboard manual.

    http://rufus.akeo.ie/
  3. Run dxdiag and report back the manufacturer of the bios if you can.
  4. NEW CMOS battery...
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