I have a dc in one of our child domains that has a problem I've never seen before. The administrator installed Quark Licensing on the server (at least thats the last event he remembers happening). Since then when you try to go to ADUC or any other AD tool you get a "library not registered" error.
He has uninstalled the questioned software, ran dcpromo down and then back again, both were successful. The errors are still there. Suggestions?