I'm trying to upgrade from Windows 7 to 10 using the Windows 10 setup program I downloaded to the workstation.

Upgrade first failed saying this needed attention:

Intel C600 Series Chipset SAS RAID Controller

I don’t use RAID so I uninstalled the driver. On reboot the system re-installed the driver. So I uninstalled the driver and chose to remove the software from my computer (probably a big mistake). Then system wouldn’t start normally. Now I can only start using Last known good configuration.

I've tried the Windows 10 upgrade a number of times since with different outcomes (all failing) and have tried to install /update drivers using Dell Support Assistant and downloaded from reputable sources on the web. 

The last time I tried the upgrade I got message that SAS Controller (Intel Corp) device isn't compatible with Windows 10.

According to this Dell page the T7600 should be compatible with Windows 10 Build 1511. Not sure if it’s compatible with the latest build.

Grateful for any advice on how I can upgrade from here - thanks.