Installed SSL on Windows Server 2003. Now get error

I had a perfectly working SSL that was due to expire on https://megameet2.com. I applied for and received a new SSL, and installed it. Now https://megameet2.com/smm/scripts/user_login.asp gives an error:

This webpage is not available.

The webpage at https://megameet2.com/smm/scripts/user_login.asp might be temporarily down or it may have moved permanently to a new web address.

More information on this error
Below is the original error message

Error 107 (net::ERR_SSL_PROTOCOL_ERROR): Unknown error.

I have restarted IIS, rebooted the server, uninstalled and reinstalled the cert, tried IE8, Chrome, Firefox on 2 different machines. What did I do wrong?