Excel 97 and Common Controls

Running Excel 97 sr2 on Win 2000 Pro:

I have an Excel project with a reference to MSCOMCTL2.OCX that worked great in Win 9X. I cannot seem to add an Excel reference to that file in Win 2000 Pro. When I browse to the OCX from the Visual Basic | Tools | References menu in Excel, I get a “Error Accessing the System Registry” message. Is there a Win 2000 equivalent? What do I do?