How can I uninstall Microsoft Office and all its registry keys?

Now Then
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I have a problem with a third party piece of software integrating with Microsoft Office (2016) in Windows 10. According to the manufacturers of the third party software, there are registry keys left over from a previous installation of Office.  If I remember rightly, I had to reinstall Office due to some problem. I am guessing that when I uninstalled the first installation of Office, it failed to remove some keys. So, I would be happy to remove all traces of Office and start again. Does anybody know how I can do that? Does software exist that will do that for me?
Thank you in advance.
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Principal Software Engineer
Commented:
I would be happy to remove all traces of Office and start again.

Unfortunately this can't be done 100%.  Office can be got out to the point where Windows works mostly as it did before Office was installed, but Office makes too many changes in a Windows system.  The software can be removed, the Program Files directories can be removed, but there are always leftovers ... file associations, registry keys, modifications in the Windows directories, leftover DLLs.  Not even Revo can get all the leftovers out and IMO, it would be dangerous to try to do so.  Some things are left behind because trying to get rid of them would "impact" the system.

If you need a truly clean start-over, then restore the system from a Restore Point made before Office was first installed; this will at least get back to "clean" (i.e., pre-Office) Registry hives.  If that's not practical, restore the system from the most recent full backup done before Office was first installed.

If neither of those are practical, reload Windows and vow that in the future a full backup of the entire system partition will be done before installing any software that comes with an install procedure.
Most Valuable Expert 2013

Commented:
Although it can't be removed completely most traces can be erased using Microsoft's uninstaller ("Easy Fix") tool. This can be further complicated if the machine was originally supplied with a "Click-to-Run" Office trial and then a copy of Office 2016 is installed from disk.

Easy Fix tool on this page:
https://support.office.com/en-us/article/uninstall-office-from-a-pc-9dd49b83-264a-477a-8fcc-2fdf5dbf61d8

You could also look at Revo Uninstaller to clean up some of the orphaned registry entries but, as Dr Klahn points out, your aim to remove everything is unlikely to be met although it may be enough to allow your third-party app to stop complaining and install.
Now ThenNot applicable

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Commented:
"This can be further complicated if the machine was originally supplied with a "Click-to-Run" Office trial and then a copy of Office 2016 is installed from disk."
Yes, this is exactly what has happened. You expressed it very succinctly.
Thank you to Dr. Klahn and MASQ for a couple of good suggestions that I can give a try.
Fingers crossed.
SOME registry keys will be part of Hkey_current_user. This is a part of the registry containing user settings, a different version exists for each user profile.

If you create a new profile, a new version of Hkey_current_user will be created. This may not contain the problematic keys.

Therefore, if you have not tried already, it might be worth creating a new user on that machine, then trying that.
Now ThenNot applicable

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Commented:
Thank you Mal Osborne. I have actually already tried that.

I was just about to try using the two programmes recommended above when I was told by the user that the addin problem is intermittant. That seems weird to me.

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