It sounds like you have downloaded the latest BIOS.
If the PC is running fine, don't worry about it.
If you do want to, then you will need to copy that .ROM file onto a USB Pen drive and boot into BIOS. ASUSTeK Computer Inc.-Support-
That is a walk through on how to update on an asus board.
But as i previously, if the PC is running fine and starting up normally and what not, then ignore those.