Is the device marked with a yellow questionmark in the device manager? Then you could try to reinstall the driver (right-click on the device should give you that option). You don't need a special driver, the ones shipped with Windows are perfectly OK (should be found automatically). Otherwise you might want to try a system restore (like this: http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/systemrestore.mspx) using a restore point from a time when everything worked well.
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