Cannot delete ms sql server registry entries

Hi

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

H E L P
RockjodoAsked:
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Jay_Jay70Commented:
try using a program like registry mechanic to scan and clean for you
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grigory7811Commented:
seems like registry corruption
what error you see?
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TomTinsleyCommented:
use Registrar Registry Manager from http://www.resplendence.com/. Take ownership of the keys, give the keys MACHINENAME\Administrators Full Control and delete from child keys to the parent.
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