Context: Windows 10 64bit.

I have LibreOffice (32bit) installed and I want to upgrade to LibreOffice 5 (64bit). I find that I can't upgrade to 5 and can't remove 4 due to a registry key issue (which also appears when trying to upgrade.)

According to Event Viewer, in the Applications panel, there's an Error which was logged during the last attempt to uninstall LO4. It reads,

Product: LibreOffice -- Error 1402.
Could not open key:  HKEY_LOCAL_MACHINE32\Software\Classes\.pcd\OpenWithProgIDs.  
System error 5.  
Verify that you have sufficient access to that key, or contact your support personnel. 

Now given that the uninstaller has to run with Administrator privileges it seems odd that I would not have "sufficient access to that key."

What's odder is that there's an HKLM32 in the first place. I've run RegEdit and I can find HKEY_LOCAL_MACHINE\Software\Classes.pcd\OpenWithProgIDs but no sign of a HKEY_LOCAL_MACHINE32\Software\Classes.pcd\OpenWithProgIDs.

Where to from here?

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