If you are running Win7 or Vista you can try Disabling the Aero theme and see if that helps.
Disable Aero
Win7
1.Choose Start > Control Panel > Personalization, or right-click desktop choose personalization.
2.Select any of the themes in the Basic And High Contrast Themes category.
Vista
1.Choose Start > Control Panel.
2.In the Appearance and Personalization section, click Customize Color.
3.Click Open Classic Appearance Properties For More Color Options.
4.Select a Color Scheme other than Windows Aero, and then click OK.
Enable Aero
Win7
1.Choose Start > Control Panel > Personalization, or right-click desktop choose personalization.
2.Select any of the themes in the Aero Themes category or in the My Themes category, if you saved a personalized Aero theme.
Vista
1.Choose Start > Control Panel.
2.In the Appearance and Personalization section, click Customize Color.
3.Choose Windows Aero from the Color Scheme menu, and then click OK.
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