Enterprise CA Server removed

Hello all,

We have a fairly large Windows 2000 AD domain and someone in our network has
installed a Certificate services on a machine and configured it as a
enterprise CA to issue a certificate to a web server, probably without
understanding the consequences of this. Now this server acting as a
enterprise CA server has been reinstalled without backing up anything of the
CA DB or the configuration.

Can anyone say how this will impact our AD-domain? Can we install a new
server in our domain as an enterprise CA and issue som kind of CRL to get
rid of the Certs issued by the "rouge" CA server? Advise anyone ?

TIA