forus
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QuickFinder, thank you for your response.
But I have a desktop computer, and the drivers for my graphics card are up to date (4670). I doubt that DirectX is very old; at the very least, it's version 9.1, but I'll check. Adjusting the resolution settings didn't help.
Actually, today I installed Windows 7 on my second system, and there's no such glitch there as there was in Windows XP.