Somehow the .dll was deactivated. This can sometimes happen when new software or applications are installed. Thankfully, with Windows ME, 2000, and XP Microsoft made a way to re-activate the dll files called Regsvr32.

If you get a missing dll or missing ActiveX message, first do a search for the file. If you find it, then go to Start/Run and type in "regsrv32 (space) dll name" then hit OK.

Hopefully this will solve your problem.