registration lost due to W2K EFS

I have recently lost all my data and email archives on a W2K machine because W2K decided to kill my user profile and so denied me access to EFS encrypted data partition. I've lost loads of stuff, and had specialist recovery to try and retrieve it but to no avail. How can I get my registration details again? I paid by CC online originally, and it wasn't that long ago either. I also emailed suggestions afterwards? Is there any way to get my details without having to pay again?

Simon Blake