Hi swanny3. Right click on any part of your desktop and select "Properties". Click on the "Settings" tab. Click the "Advanced" button. Click the "Monitor" tab. Click the down arrow alongside the "Screen refresh rate" box. Now select the refresh rate you want. If there is a tick in the "Hide modes that this monitor cannot display" box, then you should only have valid refresh rates offered. After making the change and OKing out of the settings you should be given the option to confirm that the changes are acceptable before making them permanent.