Your UEFI BIOS will normally have drivers
for these devices stored in the hidden System partition on you GPT formatted hard disk.
Have you made any changes to your HDD, created or deleted partitions, or formatted it?
Does your keyboard & mouse work in Windows? Is this a problem only in BIOS?
The Clear CMOS procedure will reset all the BIOS settings to default, the condition they were in when you first got the computer. This is easier done from inside the BIOS but you can't do it that way.
There is normally no problem with the system working or Windows starting after a BIOS reset. But because this is the new UEFI BIOS (which I do not have) I can't tell you this with my normal level of certainty.
I will see if anyone on the forum has done this.