I’ve came accross this error message a few times now when renewing a certificate in IIS7, and it has still caught me out more times than enough. Thankfully it is quite an easy error message to resolve. I’ve detailed the steps below:

– Open MMC->Certificates->Computer
– Expand Personal->Certificates
– Import your .crt file
– Double click the certificate
– Click on the Details tab and find the thumbprint
– Open a CMD window and enter the following:
certutil -repairstore my "Paste the cert thumbprint here"
– You should now be able to see the certificate in IIS manager.