I have a server (Windows Server 2008 R2 Domain Controller with Exchange 2010 Installed) that was being worked on where a tech disabled IPV6 (unchecked the box) and rebooted. When it comes back up, it hangs on "Applying Computer Settings" and won't go any further. Booting to safe mode (of any kind) won't allow login as it is the only domain controller.
I have read that IPV6 should never be disabled this way, but this is the first experience I've had with it already having been done and causing issues. How can I get it re-enabled on this server? I can't RDP to it but it does respond to pings and seems to be handing out IP addresses (via DHCP), responding to DNS requests, etc. Exchange won't come up and login screen never appears.