I don't know if this is relevant or not, but the following message showed up in the Windows 8 Upgrade Assistant as it checked the computer to see if it was ready for Windows 8:
"Secure Boot isn't compatible with your PC
Your PC's firmware doesn't support Secure Boot so you won't be ale to use it in Windows 8."
Could it be that I need a different driver that is signed?
I don't know much about this - not sure if this was relevant or not, but thought I should post it here just in case.