Clear the cache under settings then apps then click on Google search or whatever it says.
From my smokin' hot N4
That's a good thing to start with. Can you give us a few more details about what's happening? So you're going to the System Settings screen? Or are you opening Google Search or Google Now, and tapping the Menu button to go to its settings? Does it freeze in the settings screen, or does it freeze if you go back to Google Search?
Yes, Google Now is part of Google Search. I'm glad you figured it out--Clear Data can help correct various issues, presumably if there's some bit of bad data associated with the app. It's a little more drastic than Clear Cache, because Clear Data will also clear out any settings you may have chosen, returning it to default.