There's not a lot of detail here, but here goes...<br>
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Under certain circumstances, installing IE4 can cause DnD to stop working in Explorer windows (including the root desktop window).<br>
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Unfortunately the only fix I've ever found for this problem is to do a clean reinstall of Windows.<br>
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Perhaps you could tell us a bit more? Why did you have to reinstall NT, for example?<br>
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Peter.