My guess is a badly written video card driver. Ask your client to contact the laptop vendor.

>One of our clients uses a laptop with a second "duel" monitor.
>
>If he moves our application window onto the second monitor (the external one) and then closes it he gets an error...
>
>"OLE error code Dx."
>
>From then on any time he opens the application he gets the exact same error.
>
>Restarting, reinstalling our software etc has not impact, but....
>If he creates a new user login that clears it up untill he does it again.
>
>Anyone have a clue as to what might be going on here?