Certificate Services won't start

Certificate Services won't start after importing registry settings from old certificate server.

I installed ca as a role and imported the certificate with the wizard and everything seemed to be find the certificate services were able to run. 

I open the registry file and edit it so that winnt is replace with windows and then I import it. and ever since then I receive the error:

The system cannot find the file specified. 0x2 (wind32: 2)

The policy module for a CA is missing or incorretly registered. To view or change  policy module settings, right click on the CA, click on the CA, click Properties, and then click the policy Module tab. 

Please Help Im need to get cert services running again, 

Thanks