I've just resolved an issue I was investigating.
The data administration tool (WebDataAdmin.msi) installs SQL Server 2000
DMO DLL's. These "break" an installation of SQL 7 Enterprise manager on
that machine (if it exists).
See MS KB article
PRB: Errors When You Redistribute SQL Server 2000 DMO Clients in SQL
Server 7.0 Environment (Q295026)
If, like me, you were unsure why your Enterprise Manager wasn't working
this will help.
(Note SQL 2000 Enterprise Manager has a more restrictive distribution so
if you had the SQL 7 version you may not get it's successor without
upgrading to Vstudio Ent Developer, a developer licence... This is a
bone of contention with many developers!)
Mike Gale, Decision Engineering (NZ) Ltd.