I have confirmed this works fine on both XP (32-bit) and Vista 32-bit, but not on 64 bit Vista, I just get a nice big red X, I am running it with Administrative privelages.

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Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Stack Trace:
   at MindFusion.Scheduling.WinForms.xffb07cf61499e18a.x51d3a13ecd447601(x19ec7fda2bd7
290d x0f7b23d1c393aed9)
   at MindFusion.Scheduling.WinForms.x11db8fc7f469a2fc.x51d3a13ecd447601(x19ec7fda2bd7
290d x0f7b23d1c393aed9)
   at MindFusion.Scheduling.WinForms.xf1578fff91162044.x51d3a13ecd447601(x19ec7fda2bd7
290d x0f7b23d1c393aed9)
   at MindFusion.Scheduling.WinForms.Calendar.OnPaint(PaintEventArgs pe)
   at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)
   at System.Windows.Forms.Control.WmPaint(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

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Look for the download link on the private messages page. Please, let me know if there are further problems.