After Installing Office 2010 if you try to use DatasheetView option in SharePoint 2010 List, you are thrown with a error:
The list cannot be displayed in DataSheet view for one or more of the following reasons: blah blah.....
For some reason Access is still relying on AccessDatabaseEngine which is a 2007 Office System Driver: Data Connectivity Components. Microsoft doesn't say much about this component as a prerequisite either.
Download and install this component and it will fix your error.