Just in games? Why?
I recommend running a decent refresh rate all the time. You can set a higher refresh rate in windows by right clicking on desktop, choose the "properties" menu option, click the "settings" tab, click "Advanced", click the "Monitor" tab, choose the highest listed refresh rate in the drop down list and click OK.
I think that increasing monitor refresh increases game refresh as well as desktop.. (can anyone confirm?) so with vsync you'd go from capping at 60 to caping at 85 if moving from 60hz to 85hz... right?
Mo