Reinstall your motherboard's ethernet driver? You updating your drivers before upgrading to Win10 doesn't really help since Win10 needs specific drivers. Here's the current one for your motherboard: http://us.msi.com/support/mb/Z97-GAMING-5.html#down-driver&Win10 64
Huh. I tried the different (manual) install and it worked. I didn't expect that to work considering the computer already had the Windows 10 network driver. Oh well!