CRTs draw the image you see on the screen line by line. A rate of 60Hz means the screen is redrawn 60 times per second. That's fast, you may say. Its actually not fast enough. You can still see the flicker if you see the monitor with your 'peripheral vision' - if you see the monitor without looking at it directly and stare at some thing like the monitor's base.
To check your monitor's refresh rate, right-click on desktop, select 'Properties...' to get the Display properties dialog box. In the 'Settings' tab, click on 'Advanced' button. Select the 'Monitor' tab there.
The Monitor's current refresh rate is displayed.If its set to 60 Hz, you can notice the flicker very easily. I would recommend a minimum of 75 Hz or a higher setting, if your hardware supports it.
If there are no other options listed other than 60Hz, or if no other settings work, it means that either your hardware does not support the higher settings or that you have not installed the proper drivers for your video card or monitor. To see if you have any devices with incorrect or missing drivers, you can use the Device Manager (Control Panel > System > Hardware > Device Manager)
Please note that the Refresh Rate Setting is not relevant with an LCD monitor - they display images on the screen with a very different method.
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