 <p>Open CMD, </p> <p>If you are in 32 bit OS, Run : </p> <p><code>C:\windows\Microsoft.NET\Framework\v4.0.30319&gt; aspnet_regiis.exe -i</code> </p> <p>If you are in 64 bit OS, Run : </p> <pre><code>C:\windows\Microsoft.NET\Framework64\v4.0.30319&gt; aspnet_regiis.exe -i </code></pre>