How to install a SSL Certificate for Microsoft IIS 6.0

Copy the Intermediate CA certificate from your Secure128 portal under “Order Details”.
Be sure there are 5 dashes to either side of the BEGIN CERTIFICATE and END CERTIFICATE and that no white spaces, extra line breaks or additional characters have been inadvertently added.

The SSL certificate will be sent by email. The certificate is included as an attachment (Cert.cer) and it is also imbedded in the body of the email. Copy the certificate.
The text file should look like this:

-----BEGIN CERTIFICATE----- [encoded data] -----END CERTIFICATE-----

Open the Internet Services Manager (IIS)
Click Start
Select All Programs
Select Administrative Tools
Choose Internet Information Services (IIS) Manager
Under Web Sites, right-click your web site and select Properties
Click the Directory Security tab
Under Secure Communications, click Server Certificate
The Web Site Certificate Wizard will open, click Next.
Choose Process the Pending Request and Install the Certificate, then click Next.
Select the location of the certificate response file, and then click Next.
Read the summary screen to be sure that you are processing the correct certificate and then click Next.
You see a confirmation screen. After you read this information, click Next.
Be sure to assign your site an SSL port (443 by default).
Stop and start your Web server prior to any testing.