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As the topic subject says, I'm running Windows 7 and when I launch Police Quest 1 the game lags considerably in full screen and is unplayable. Additionally, there are times when the graphics are corrupted and large blocks of graphics are missing from the screen, leaving an appearance like a checkerboard.

When I alt-tab out of full screen dosbox, or alt-enter the screen into a window, the game runs flawlessly, tiny, but flawlessly.

Any thoughts/solutions?
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I had the same problem and tried to run the game using ScummVM. That worked well, at least as far as I have played by now.