If you discover that Add/Remove programs no longer work after installing some
Windows 2000 updates, you're not alone.
Microsoft has documented a bug associated with Internet Explorer 5.5 and 6
that interferes with the Start-> Control -> Add/Remove Programs function.
For details, see Microsoft Knowledge Base Article Q265829 at http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q265829&
To fix the problem, start by reinstalling IE. If you continue to have problems, run REGSVR32 APPWIZ.CPL from a CMD window, as described in Microsoft Knowledge Base article Q266668 at http://support.microsoft.com/default.aspx?scid=kb;en-us;Q266668