In the register of Mozilla plugins cannot be deleted but one blocks the installation of MS Silverlight Update. Any suggestions?

Microsoft has tried to update Siverlight to recent weeks - each default time.
It is said that HKEY_LOCAL_MACHINE\SOFTWARE\MozillaPlugins\@Microsoft.com/NpCtrl,version=1.0 is the problem.
I tried to remove it & the whole key to Mozilla, but I get "error while deleting key. "Access is denied", in all cases. There are 14 products under MozillaPlugins.

I reinstalled Firefox to see if it would "kickstart" the chain, without success.

(Default) MozillaPlugins:Name; Type: REG_SZ; Data: (value not set).
Windows 7 Edition Home Premium.

I am the main administrator - confirmed in cmd - but everything I enter permissions is denied.

You will need to change the permissions for this key via the context menu.

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Tags: Firefox

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