Cannot Delete Persistent Registry Key

Mar 4, 2016

There is a registry key that Symantec created. After I uninstalled it it didn't go away. It is in the HKLM/SOFTWARE/WOWNODE folder. There are some other numbers in the name of the wownode folder but I can't remember them now.
Here's what I've tried so far.
Basic deletion - "cannot delete"
Giving myself full administrative permissions - "cannot delete"
Running in safe mode - "cannot delete"
Using the regdelnull utility in case it was a null key - did not find any null keys
The most powerful thing I've tried so far was to turn off my computer and boot from a windows repair disk, which allowed me to access the BIOS command line, and load the registry hive from my main windows partition. Even editing the registry offline in this way still produces the same error. I don't even understand how this is possible?
What could possibly allow the key to avoid deletion and how can I fix it?

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