 <p>Thats <code>REGDB_E_CLASSNOTREG</code> so <code>CLSID_SQLNCLI11</code> is not available, download and install the redistributable package for the Native Client (Matching the bitness of your application).</p> <p><a href="https://www.microsoft.com/en-gb/download/details.aspx?id=29065" rel="nofollow">Download</a>.</p>