my msdos program used to run full-screen in Windows XP. Now it occupies the top third of the full sc

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My old MS-Dos program ran full-screen in earlier versions of Windows, including earlier versions of Windows XP. Due to something in one of the updates it now occupies the top third only in full-screen mode, with the rest of the screen black, blank, and
scrollable (like the Windows XP version of the command prompt has always been). How do I get back to a usable full-screen version (i.e., the previous version of MS-Dos)?

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