Dynamic topology makes my cube explode

My first attempt to use dynamic topology in sculpt mode on my basic cube results in this mess you see in the attached picture. The tool sculpts properly while I hold the mouse button down, but as soon as I release the mouse button, I get the result in the attached picture. Is my computer simply too weak to use dynamic topology? Only 3 megs of RAM.

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I don’t think this is a hardware problem. The ‘‘explosion’’ happens only in Windows XP. But dynamic topology DOES work on the same computer in Ubuntu Linux.