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It normally happens when the software tries to use a capture device other than the camera. Look in the options for your program under capture device and make sure it's set to your camera.
Also, since you have WinXP; in the My Computer folder double-click on the icon of your camera. A small video window should pop up in a new folder. Is it still black or is there a picture? If it works then your camera program is configured wrong, otherwise it's probably the drivers.
In any case a look at the camera's website for the latest drivers wouldn't hurt.
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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