Dave,
Did you request the certificate from Comodo, VeriSign, Thawte, etc.? Unfortunately, I don't know what you did wrong (perhaps one of your security settings). But it has nothing to do with the WebTrust agency per-se.
Here is how it works with Comodo (if you requested a certificate from Comodo).
http://www.lindersoft.com/forums/sho...d-Code-Signing
http://www.lindersoft.com/Comodo2014.pdf
http://www.lindersoft.com/forums/sho...August-25-2015
http://www.lindersoft.com/forums/sho...ng-certificate
Hope this helps a bit.
Friedrich