Microsoft Knowledge Base Article 239938 contains the following summary:

A utility that helps you completely remove Microsoft Office 2000 is available from Microsoft. The Office 2000 CD1 File and Registry Eraser Utility removes most of the files and Windows registry settings that remain on the computer after you remove Office. This utility is designed to be used on stand-alone computers or workstations. Do not use this utility to completely clean a working copy of Office from a computer. Run this utility only after you run the Setup program for Office 2000, and then click Remove Office.

When you expand the Eraser2k.exe package, the following seven files are extracted:

   Eraser2000.exe
   Oclean9.dll
   Offcln9.exe
   Offcln9a.opc
   Offcln9b.opc
   Offcln9e.opc
   Readme.txt  
                               
For information about using the utility, read the Readme.txt file. Partner Information This utility does not remove any Internet Explorer 5 components. IMPORTANT:
The Office 2000 File and Registry Eraser Utility does not run on operating systems later than Windows 2000.
The Office 2000 File and Registry Eraser Utility has not been tested with Microsoft Windows XP.
Microsoft does not recommend or suggest that you use the Office 2000 File and Registry Eraser Utility on Microsoft Windows Server systems, which include those running Small Business Server. This issue can also affect a Windows Workstation when used as a server. It is possible that this utility can cause your system to stop responding when you restart your system (note that this depends upon the state of your system).

Microsoft recommends that you backup all critical data before you run this utility. If this issue occurs, please contact Microsoft Support Services. To locate support options, visit the following Microsoft Web site: