when i go to iron clad in the main menu and i go to create an account it asks for the cd key, i put the serial number in but it says that i have an invalid cd key
I have a similar problem. I've entered my username, password (2x) and my cd key (with dashes), but the "ACCEPT" button is grey and won't read my click.
I.e. it won't let me submit my data and I can't even begin to log in.
Those are in all probability two very different issues. What security software (firewalls etc.) are you running? It could very well be a firewall blocking something because you haven't given SINS outbound access.
Try Alt-tabbing (or temporarily running SINS in windowed-mode) to see if there is a firewall prompt waiting for user-input.
EDIT: Oh and Cap_James it might be helpful to others for you to post back with how you were able to resolve your issue. Forums aren't here just for the "asking", they're here to help your fellow gamers in need as well.