Screen Problems Running Heroes of Might and MagicID: Q189154 
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When you run Heroes of Might and Magic by New World Computing in Windows 98, clicking an object with the mouse may leave a residual rectangle on the screen.
This behavior can occur if you are running the game in full-screen mode and you are using a Trident Super VGA display adapter. Heroes of Might and Magic does not refresh the display correctly under these conditions.
To work around this behavior, use either of the following methods:
The third-party product discussed in this article is manufactured by a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.
Keywords          : kb3rdparty kbenv kbhw win98 
Version           : WINDOWS:98
Platform          : WINDOWS 
Issue type        : kbprb 
Last Reviewed: February 11, 1999