Cannot delete ms sql server registry entries


Long story short - had some problems with my Windows 203 server system and I am trying to reinstall various tools etc.  One of the tools depends on ms sql server and won't install - seems like there is a partial install of sql server still on the system that I can't get rid of. I want to delete  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer etc., but regedit throws an error and says that it can't delete these.  
Tried in safe mode with the same results

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try using a program like registry mechanic to scan and clean for you

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seems like registry corruption
what error you see?
use Registrar Registry Manager from Take ownership of the keys, give the keys MACHINENAME\Administrators Full Control and delete from child keys to the parent.
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