2.On the Settings tab, under Screen resolution, drag the slider, and then click Apply.
3.When prompted to apply the settings, click OK. Your screen will turn black for a moment.
4.Once your screen resolution changes, you have 15 seconds to confirm the change. Click Yes to confirm the change; click No or do nothing to revert to your previous setting.
Note Related topics at bottom of page.
And your settings don't hold?