Unfortunately none of that worked. I was wrong about the Hz, it's actually 75 but that would still not be recognized by the game.
Actually NWN2 does support 75Hz Refresh Rate, so you should be seeing those options.
The GOG installer tries to install the correct version of DirectX 9.0c but it is sometimes blocked by your antivirus software.
Don't use the web installer if you are on windows 10
Make a new temporary folder on your desktop.
Go to Microsoft http://www.microsoft.com/en-us/download/details.aspx?id=8109
And download the June 2010 runtimes to the temporary folder .
No one gets viruses from Microsoft, but you can scan the downloaded files first if you are worried, then
Disable your antivirus software.
Then scroll down and run DXSETUP.exe (see pic)
When it says, Installation Complete, you can delete the temporary folder, and re-enable your antivirus software.