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That message is displayed when Windows DWM is disabled. Disabling DWM can improve the performance of 3D rendering applications, such as Vizard. Vizard 4 has an option to disable DWM. If you are still using Vizard 3, then it sounds like the file properties of winviz.exe were modified by somebody to automatically disable DWM.
If you do not want DWM disabled, then right click on winviz.exe, which is located in the Vizard/bin folder, and click Properties. Under the Compatibility tab, make sure Disable desktop composition is unchecked, then press OK.
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