Site stops working after new verisign certificate installed

Our company is moving a Website to a new dedicated server.  This website was configured as a separate website on its server.  It was configured to use SSL.  It was given a host header.  Another site was also set up using the same DNS but not using SSL. (So you could access ii using http://www.sitename.org for the unsecured site and https://www.sitename,org for the secured site.)  the secured website was previosuly using a "rool  your own" certificate on the old server.  We moved the to web applications to the new server, configured them as "websites" (The unsecured site was configured as the Default Website.)   After checking the site to ensure it was working, we applied for a Verisign certificate.  As this was taking some time and we needed a certifcate to continue testing we utilized MS Certificate Services on Windows Server 2003 to create a local certificate.  We install the created certificate on the server.  Then we deleted the pending request on the web site in the Web Server Certificate Wizard, and assigned an existing certificate using instruction found on the page "HOW TO: Install Imported Certificates on a Web Server in Windows Server 2003"  in Microsoft's Help and Support site.  The sites were given the needed Host headers.  These host headers were added to the hosts files of the machines of the user carrying out test along with the IP address of the server.  (The server has still not been made visible to the outside world.)    Everything was working fine.  Every control on every page fine in IE and in the area that have been tested with Firefox and Netscape. Then the verisign certificate finally arrived.  We were sent two files.  One was a 509 file and the other was a PKCS#7 file.  I copied the contents of the 509 file to an empty text file and saved it as a cer file.  I copied the contents of the PKCS#7 file to a text file and saved it as an spc file.  We again imported the certifcates to the server Certificate Store using instructions found on above cited page, removed the assigned "roll your own"  certificate from the site and assigned the new certificate, (the ones listed in the certificate store using the site's name), to the site.  Now IE states "Internet Explorer cannot display the Webpage."  No error message.  Use friendly http errors is turned off so that is not the reason it is displaying this non-error message.  The event viewer of the server reports "The SSL Server Credential certificate does not have a privatekey information property attached to it.  This most often happens when a certifcate is backed up incorrectly and later restored.  The message can also indicate a certificate enrollment failure."  When I put the "roll your own" certificate back on the web site everything works as it is supposed to.  

OK so what did I do wrong and how can I fix it. I am only allowed to issue 500 points at a shot.  So that's what I'm offering.  "Please help me Obi-wan Kenobi.  You're my only hope." Start Free Trial