Dave Goldman I could find following stack trace from event logs
Application: CertificateService.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.Security.Cryptography.CryptographicException
at System.Security.Cryptography.CryptographicException.ThrowCryptographicException(Int32)
at System.Security.Cryptography.X509Certificates.X509Utils._ExportCertificatesToBlob(System.Security.Cryptography.X509Certificates.SafeCertStoreHandle, System.Security.Cryptography.X509Certificates.X509ContentType, IntPtr)
at System.Security.Cryptography.X509Certificates.X509Certificate.ExportHelper(System.Security.Cryptography.X509Certificates.X509ContentType, System.Object)
at CertificateService.GetCertificateFromLocalMachineStore()
at CertificateService.Main()