How to cleanup AD?

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http://serverfault.com – I have a fairly hosed Windows 2012 AD. I would like to resolve the issue if possible. I have done many things to try and resolve this with little success. Brief history; I had a Domain, that was renamed poorly. As a last step, we added a second DC, on the new domain. It was evidently not done correctly either, and the original DC was demoted without testing the new DC fully. At this point we cannot connext with any AD tools to the domain. Here are two bits of info that may help point us into the right direction; 1) When I look at NSLOOKUP for the gc IP's I get the following; C:\Windows\sy (HowTos)