If you try to open a SharePoint 2010 list within the "Datasheet View" the following error appears:
The list cannot be displayed in Datasheet view for one ore more of the following reasons:
- A datasheet component compatible with Microsoft SharePoint Foundation is not installed.
- Your Web browser does not support ActiveX controls.
- A component is not properly configured for 32-bit or 64-bit support.
There is a Microsoft component necessary to be able to use the "Datasheet View":
- 2007 Office System Driver Data Connectivity Components
After installing this package, you should be able to use the "DataSheet View".