99 should be normal? Id look elsewhere first.
If you didn't already try the PCIe card to see if its the onboard or what.
EDIT: Should have read the whole thread... lol. Glad it was something easy.
As far as the bios thing, go to ext6 website and flash to the latest is my suggestion. THere are instructions in your manual. If you have a dual bios no harm in flashing one bios when you have two.
If its working... get to windows and run CPUz and see what it says about the bios. But, yeah, i would flash it now if you have dual bios.
Theres always a slight load in the bios.. worry about it when you get to windows.
EDIT2: Last... make a signature with your hardware man.
Your board says its an extreme 6 on it right?