64-bit MSDASQL

Hi,

I got the 64-Bit MSDASQL through the following link and install it on Windows xp 64-bit:
http://www.microsoft.com/downloads/details.aspx?FamilyID=000364db-5e8b-44a8-b9be-ca44d18b059b&displaylang=en

But

_bstr_t strConnect="Provider=MSDASQL;Driver={Microsoft Access Driver (*.mdb)};Dbq=C:/test/test.mdb;";

// create Connection object

m_pConnection.CreateInstance("ADODB.Connection");

hr =m_pConnection->Open(strConnect,"","",NULL);
...

I always get the error "Data source name not found and no default driver specified". I'm sure the test.mdb file exists and the code works well on windows xp 32-bit but fails on Window xp 64-bit even I install the above package. Anybody can help me? Thanks!!