When we test DateTimepicker DateSelectionMode="Month" or DateSelectionMode="Year" and InputMode="DatePicker"
telerik component on "Windows home premium" (Telerik components does not installed on this computer.) .
We take the error message, after that we tasted yours Website Silverlight demo page, this error did not change.
if you test it, you can see on your page is the same error.
at the same time, it works other "Windows operating system".
in this case, What should we do?