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I was trying to demote my older server (Win2008) from comand prompt using my admin account.While I was trying to run it I was getting errors...<br />
“Active directory domain services installation operation failed access is denied”.<br />
After researching that errors I ran it again but this time I got two errors with messages. I’m wondering if I should try to run dcpromo once again or just remove DNS by deleting it and then use Server Manager to remove AD DS role…?? I’m including two last messages which appeared on the server which I had executed that cmd &quot;dcpromo&quot;…Obviously I rebooted that server already...<br />
I'm &nbsp;already running two servers with Windows 2012 R2 for last few months and I would like finish this procedure...<br />
<a href="https://filedb.experts-exchange.com/incoming/2015/08_w33/928532/4-tobesend.png" target="_blank" class="file-inline" title="DNS not removed (10 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>4-tobesend.png</a><br />
<a href="https://filedb.experts-exchange.com/incoming/2015/08_w33/928533/5Capture.PNG" target="_blank" class="file-inline" title="AD DS binaries still installed (83 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>5Capture.PNG</a>
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4-tobesend.png

5Capture.PNG

I was trying to demote my older server (Win2008) from comand prompt using my admin account.While I was trying to run it I was getting errors...
“Active directory domain services installation operation failed access is denied”.
After researching that errors I ran it again but this time I got two errors with messages. I’m wondering if I should try to run dcpromo once again or just remove DNS by deleting it and then use Server Manager to remove AD DS role…?? I’m including two last messages which appeared on the server which I had executed that cmd "dcpromo"…Obviously I rebooted that server already...
I'm  already running two servers with Windows 2012 R2 for last few months and I would like finish this procedure...

Dcpromo

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.