I'd suggest you find the instructions for flashing your bios... you can often fine one where you download your bios. Also it should be in your motherboards manual if you have that. Make sure these are printed on paper for reference while you are flashing.
It can be a risky event flashing the bios but if done properly then there really is no cause for concern.
Also look for a utility that'll flash the bios within windows but don't use any third party apps, make sure if you find and use one that it's by the same manufacturer of your mobo.