MS Access Connection fails when running package

I'm running SSIS from VS 2005 with a connection to a MS Access db from Office 2007 (I think).

I'm trying to add a package that picks up data from an MS Access system.

Right now I've set up a new package with a connection to the .mdb file and a data flow task with an OLEDB data source going to a row count task. When I configure the OLEDB data source and choose Table or View I get the list of tables from the .mdb. I can even see the columns in the table I choose. However when I execute the package or task, it fails with:

[OLE DB Source [1]] Error: SSIS Error Code DTS_E_CANNOTACQUIRECONNECTIONFROMCONNECTIONMANAGER.  The AcquireConnection method call to the connection manager "TestMSAccessDB" failed with error code 0xC0202009.  There may be error messages posted before this with more information on why the AcquireConnection method call failed.

Any ideas on what's up with this? Thanks!