I had this annoying error while trying to get the cluster service going on a 2012 R2 host that had its cluster ungracefully blown away. Turned out doing so leaves the remnants of the cluster in AD and elsewhere. This host also had the McAfee AV managed agent installed on it.
I tried to remove the clustering role, rebooting, re-adding – all to no avail.
Looked like the AV agent was holding onto some cluster files. Now how to get rid of the managed AV agent. Attempting a uninstall from Control Panel throws the following error: McAfee agent cannot be removed while it is managed mode.
Open up an elevated command prompt, not elevated PoSh window!
Go to c:\Program Files (x86)\McAfee\Common Framework
and run FrmInst.exe /forceuninstall
This gets rid of the McAfee agent for good. Reboot host for good measure.