This is a very frustrating thing, I admit.
When you FIRST install SBS 2008, you come to a screen EARLY in setup where is MUST find your network adapter.
If it cannot see one, it stops installation and offers you 2 options:
"Open Device Manager to install drivers"
Now here's the rub.
I downloaded the correct driver from Intel. It's an EXE installer file.
I have verified this is the correct driver multiple times.
When I run this EXE i get "The product is not supported on this operating system. Abotrting setup." by the installer.
it's a winrar auto unextracting auto running type of exe.
Now here's the best part...
The motherboard is a supermicro which has 2 built-in INtel pro nics, and the last time this box had this EXACT SAME ISSUE, the solution was to buy a cheap nic and bypass the motherboard NIC's.
THIS is the situation, the 3rd cheap intel Gigabit CT desktop adapter acts just like the 2 pro nics now. No matter what drivers I use, no matter what files I try and execute, all behave identically.
Is there a way to install this freaking driver from hell in a way OTHER than device manager and a failed EXE self extractor file???? I've tried browsing to the exe file that the setup file WANTS to execute once extracted, same error.
I have tried everything I know.