My Webmatrix is freezing when i right click on a file

I get stuck with my webmatrix he is freezing when i right click on a site file

this is the error in the Webmatrix.exe.log:

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22-8-2013 18:01:50
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System.ComponentModel.Win32Exception (0x80004005): Not enough quota is available to process this command
bij MS.Win32.UnsafeNativeMethods.PostMessage(HandleRef hwnd, WindowMessage msg, IntPtr wparam, IntPtr lparam)
bij System.Windows.Interop.HwndTarget.UpdateWindowSettings(Boolean enableRenderTarget, Nullable`1 channelSet)
bij System.Windows.Interop.HwndTarget.UpdateWindowPos(IntPtr lParam)
bij System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wparam, IntPtr lparam)
bij System.Windows.Interop.HwndSource.HwndTargetFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bij MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bij MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
bij System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
bij MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

i tried to reinstal it but it didn't helped

please help me