Can't get Nvidia Inspector to work.

http://www.pcgamer.com/2014/04/21/dark-souls-2-pc-tweaking-guide/1/

I've been following this guide to improve Dark Souls 2 looks, but I just can't get Nvidia Inspector to actually work. I'm running it as administrator and I've tried manually adding the game to it, but it just does not work. It doesn't work for any game actually, even though it use to months ago. I'm not sure why it stopped. Anyone know why it wouldn't be working?