What video card are you using? Updating it might fix the issue, since a lot of people forget about updating drivers.
If you post your video card I could give you a direct link to the latest driver, but for now I guess this'll have to do.
NVidia Drivers: http://www.nvidia.com/Download/index.aspx?lang=en-us
AMD Brand Drivers: http://support.amd.com/us/gpudownload/Pages/index.aspx