When you install, uninstall, and reinstall programs on your computer, registry keys are created, modified, or deleted. Over time, your computer's registry may begin to contain corrupted, unused, and unnecessary registry keys, especially if keys are not removed when you uninstall a program. As a result, you may begin to experience problems when using OLE to embed objects or Automation to control other programs. The RegClean utility is designed to clean up unnecessary entries in your Windows 95/98/NT/2000 registry. RegClean analyzes Windows Registry keys that are stored in a common location in the Windows Registry. It finds keys that contain erroneous values, and after recording those entries in an UNDO.REG file, it removes them from the Windows Registry. You must have the updated version of the OLEAUT32.dll. If your system has Internet Explorer version 2.0 or lower, installing Internet Explorer version 3.0 or higher will update the OLEAUT32.dll. If you are using Microsoft Windows NT 3.51 with SP 4 or lower, you will need to install SP 5 in order to update the OLEAUT32.dll.