In Windows, this is arguably slightly more complicated.
Insert a floppy disk into your drive and right-click the corresponding drive symbol inside the Windows Explorer (usually A:). Delete all files except Command.com, and from the disk, even those that are invisible.
You will need a ISO image as well, and Free DOS is the most appropriate for installing BIOS updates.
Once you have the bootable drive, In the unlikely event you have to update from a floppy, a bootable disk can be created by entering format a: /s into the command prompt (in DOS).
However this isn't always the case, even for new motherboards or laptops, and it's possible that you will have to create a bootable CD or USB drive and copy the files to that.
Plus, you should note down the revision number – for example REV 1.03G as it may require a different BIOS file to previous revisions.
If you have a laptop, you need only to find the make and exact model of the machine itself.
In most cases, nothing will go wrong at all, but it's important to know that there's an associated risk and not to treat the process too lightly.
It's good to have a spare copy of all important files from your PC before you start.