Taken from here.
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On the My Computer icon right click with your mouse and choose Properties. (My Computer can be found on the desktop and/or the Start menu depending on how you have your Windows XP setup.)
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A small window will have appeared called: System Properties. Look for the “tab” along the top called Advanced, now click it.
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Now look for the section called Performance and click the button called Settings.
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You will now see a new window appear called Performance Options, click the tab along the top called Data Execution Prevention and you should get the same window view as the image below.
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- You may now choose to turn it off.