IMO...flashing the BIOS is an action to be considered...only when it's apparent that a BIOS update/flash will enable some (hardware/system) capability that doesn't exist otherwise.
The details for such updates will provide descriptions.
Aside from that, I would never think that a BIOS update would be useful. Of course, I don't have any OEM (HP, Dell, etc.) systems so I don't know why they seem to throw such updates out there for their customers.
The only hardware items that I can think of which might start me thinking about a BIOS update...would be an SSD or a CPU upgrade...and only in circumstances where documentation exists that verifies that such might be necessary/desireable.
Did you run the appropriate diagnonstic on the hard drive...before installing Windows?