Heelo vitamin ... I have his error after install MDAC27 ..... This error is not showing to me before. First my application show me and error of "Class not found" ... making debug I could see that it was in a function where I use the ODBC for connect with the ldap active directory server for validation user. So ... I try to install MDAC27 ..MDAC 25 .. MDAC28 ... but it does not works ... after installed MDAC27 ... this error is not showed .... but the application show me another error of Error Connection with ldap ... in the same way of ODBC / OLEDB where I can see.. Note that my application works ... not crash, it show my an error message when the code try the function but the program not die. err:ole:CoGetClassObject class {6c736db1-bd94-11d0-8a23-00aa00b58e10} not registered err:ole:CoGetClassObject no class object {6c736db1-bd94-11d0-8a23-00aa00b58e10} could be created for context 0x1 Thanks a lot