Restoring DTS packages

I am receiving the following error message in restoring and saving DTS packages in SQL Server (SS 2000):

"Class not registered"

First time I have encountered this issue and will much appreciate suggestion on how to fix.

You can also try posting in the DTS forum:

http://groups.google.com/group/microsoft.public.sqlserver.dts?lnk=srg|||

Thanks for this suggestion.

I did post to the DTS forum, however no responses received