Problem with "Vendor initialisation failed" message

Hi !

I'm trying to use Delphi 2.0 client/server with a Microsoft SQL server
database. Each time I'm trying to connect the database, I got this error
message :

Vendor initialisation failed message : LIBSYBDB.DLL...   when using the
SYSBASE  driver .
With the MSSQL driver, the DLL specified is NTWDBLIB.DLL.

I can't find those DLL anywhere so can anyone help ?

I was using Delphi 1 client server before and I've never such a  problem.

Thanks in advance.

Olivier Hustin