Just a question on what is the best Refresh Rate for XP and running games?

Currently I have an AOC 9Glrs, running at 1028x768 and 60Hz. 60 Hz seems to be the only refresh rate my monitor will run at stable. All other rates the monitor either flickers, becomes blurry, or both. Any thoughts.....

Vid card is ATI Radeon 9800 Pro 128