Unknown error

[Phototaker]

I tried to recode to a smaller file a video that was ripped using MakeMkv from a Blu-Ray because the original is about 20 GB.Whe I tried to open the file I got this message that I don't understand.

'An Unknown Error has occured.
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.IO.FileNotFoundException: Could not find file 'C:\Windows\system32\HandBrakeCLI.exe'.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at HandBrakeWPF.Helpers.CliCheckHelper.CheckCLIVersion() in c:\HandBrake\Hudson\workspace\Release_WindowsGui64\0.9.9\win\CS\HandBrakeWPF\Helpers\CliCheckHelper.cs:line 48
at HandBrakeWPF.ViewModels.MainViewModel.OnLoad() in c:\HandBrake\Hudson\workspace\Release_WindowsGui64\0.9.9\win\CS\HandBrakeWPF\ViewModels\MainViewModel.cs:line 890
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Caliburn.Micro.ActionMessage.<.cctor>b__d(ActionExecutionContext context) in C:\Projects\Blue Spire\Caliburn.Micro\src\Caliburn.Micro.Silverlight\ActionMessage.cs:line 266
at Caliburn.Micro.ActionMessage.Invoke(Object eventArgs) in C:\Projects\Blue Spire\Caliburn.Micro\src\Caliburn.Micro.Silverlight\ActionMessage.cs:line 228
at System.Windows.Interactivity.TriggerBase.InvokeActions(Object parameter)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at MS.Internal.FrameworkObject.OnLoaded(RoutedEventArgs args)
at System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent)
at System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root)
at System.Windows.Media.MediaContext.FireLoadedPendingCallbacks()
at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
at System.Windows.Interop.HwndTarget.OnResize()
at System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Interop.HwndSource.HwndTargetFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)'


I should point out that the file will play in VLC player although it stutters a bit. I'm running Window 7 Pro i7 920

Thanks or any help.