Rebuild a root CA

I have come upon a domain that has multiple servers complaining of expired domain certificates.  Digging in it appears that there was a root CA server that is gone.  There are two subordinate CA s in the domain, which of course are now useless.

It also looks like this issue has been going on for some time.  The certificates are months out of date.

I have not been exposed to this situation without a backup of the root server.  How does one go about fixing this?
Bill HerdeOwnerAsked:
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At this point you would simply need to clean up and then create a new CA

Steps to cleanup:

Here is also a question on another site covering this:

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Bill HerdeOwnerAuthor Commented:
Is this safe on a production environment? What do I need to be "careful" of?
At this point the root CA is dead as you indicated, so nothing that chains to it actually works.

There are no real implications, simply complete the cleanups to avoid template mishaps.

It's already not working, nothing else can be broken by replacing it.
Bill HerdeOwnerAuthor Commented:
That took care of the problem.  Thank you very much.
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