We are getting this error today:
Retrieving the COM class factory for component with CLSID ... failed due to the following error:...
in a live site, that has been working fine on a daily basis. Could last night's Windows updates have broken it and what do we do?
Oh, and also The .Net Framework Data Providers require Microsoft Data Access Components(MDAC). Please install Microsoft Data Access Components(MDAC) version 2.6 or later
This happens during uploads of an excel file to our database.