serious problem with Visual C# NET

[jaekim]

I am having a serious problem where
everytime i go to a property of an control from design view
it pops up a dialog "Arithmetic Exception: Overflow or underflow in
the arithmetic operation".

So I installed the Visual C# NET to another machine.
And the exception is gone, but instead it's showing "?????" for all
the Korean characters I put in in the page in design view.

Now I can't do anything.. here.

It worked fine before, and I didn't use Visual C# NET for a while,
then
I recently started using it again, and it's in the state that I can't
use it any more.