Ok, it seems that you have no idea what is the make and model of your mobo, download CPU-Z from here http://www.cpuid.com/softwares/cpu-z.html
Install it, and run.
Check the Mainboard Tab in it.
That'll give you the make model and bios version for your mobo.
What ever details it gives you, you can either go to the website of the manufacturer of the mobo and choose the last update that they had for the Bios or then you can post the information here and we'll help you out further....