Problems Certificate Services Windows 2008

I am running a root Enterprise CA by itself on a machine that is not also a domain controller on Windows 2008.  I am getting the following errors:

EventID 87 (CertificationAuthority)
Active Directory Certificate Services could not use the default provider for encryption keys.  Keyset does not exist 0x80090016 (-2146893802)

EventID 86 (CertificationAuthority)
Active Directory Certificate Services could not use the provider specified in the registry for encryption keys.  Keyset does not exist 0x80090016 (-2146893802)

Everything else seems to be working correctly - I'm not sure what effect these errors are having...

I'm also getting errors when I drill down Roles -> AD CS -> Enterprise PKI -> <CAname>:

AIA Location #2    Unable To Download
CDP Location #2   Unable To Download

Last week, I performed an in-place upgrade of the OS hosting my CA from 2003 to 2008 and everything seemed good.  I tried to reduce the lifespan of the certificate from 10 years to 7 years using a CAPolicy.inf and was unsuccessful.  I ended up renewing the root certificate several times in the process; once choosing to generate a new key.  I don't know if any of this has anything to do with it, but I figured I'd mention it.

Thanks in advance for any assistance.