It's possible that one of the mouse cursor files has become corrupt or is
Open Control Panel and double click the Mouse applet. Click the Pointers Tab
and scroll through the selected cursors in the Customize section to see if
that black box you are seeing shows up there. If it is there, select it and
click the Browse Button to select another cursor for that function.
"Ulrik" wrote in message
> Sometimes my cursor changes into a black box, about 100x100 px, and it
> changes back when it change into another cursor (eg. when i mouse over a
> or a link).
> It comes in any programs any times.