What refresh rate does your monitor have? If it's above 60, not even Vsync would be able to prevent it from happening as the game will run at that rate and not the recommended maximum of 60.

You could use some software (e.g. your gpu vendor's app) to limit your framerate.

It's an issue related to the framerate. as mentioned above, having higher than 60 FPS will cause the game to run faster that it should be. You can either lock your framerate as suggested above, or download Oblivion Display Tweaks[www.nexusmods.com] to fix it as well.