Has your monitor got that twangy thing on, think it de-magnatises it or something, sometimes when mines got a shake on I press that and it goes "twannng", shudders then stops shaking.
I use that windiws, my screen settings are 60 hertz / hardware acceleration-full / 1024x768 highest 32bit /
Check the monitor display properties - settings tab / advanced / monitor tab if your monitor isn't selected, click properties / driver / update driver / install from list - next / don't search - next. manufacturers - models, click your model.
If that don't help, then I dunno