The first thing to try is doing an Office Repair of 365. This should reset the Windows defaults to 365 (although the installation should have done that).
Repair Office 365 / 2019 / 2016 / 2013 / 2010
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https://account.microsoft.com/
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Here are some similar articles describing how to do Office Repairs for various versions of Office and Windows. Pick the one that easiest for you to understand
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Repair Office 365 / 2019-2010 on Win 10-Vista
https://support.office.com/en-US/Article/Repair-an-Office-application-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b
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Repair Office 2013/2016 in Pictures (My WIKI)
http://answers.microsoft.com/en-us/office/wiki/office\_365hp-office\_install/repair-office-365-in-pictures/f09d64b7-cfcc-4d07-be0b-0c429682d01a
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If you still can't see 2007, you will have to take a shotgun approach. Use method 2 in the following tip. This will wipe everything, including your 365 installation, then you will have to re-install.
Note, this will delete all of your customizations AND your Outlook emails, so back up customization files like NORMAL.DOTM and PERSONAL.XLSM and your Outlook PST file.
Or you can use Method 3 to selectively uninstall just 2007 elements.
Uninstall Office 2016 / 365 – 2007
https://support.office.com/en-us/article/uninstall-office-from-a-pc-9dd49b83-264a-477a-8fcc-2fdf5dbf61d8?ui=en-US&rs=en-US&ad=US
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Method 1: Uninstall from Control Panel (or Settings dialog)
Method 2: Completely uninstall Office with the uninstall support tool (SetupProd_OffScrub.exe)
Method 3: Remove manually (Registry Hack)
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The Method 1, “Normal uninstall”, is designed with the assumption that you will be re-installing Office. It does NOT delete everything. It leaves configuration files like NORMAL.DOTM and other templates etc. It also
leaves configuration Registry entries. Normally these “carry-overs” are safe. But if method 1 didn’t fix your problem, they may be the cause.
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Method 2 (and 3) are intended to completely wipe Office from your computer
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Note:Method 1 includes links to Office
version specific re-install instructions
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Method 2
So if Method 1 doesn’t fix your problem, try Method 2. Method 2 does a more thorough job that the “normal” uninstall (aka Method 1). It deletes “everything” associated with Office
except your personal (document, spreadsheet etc) files created using Office
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* Boot the computer.
* After the restart go to http://office.com/myaccount
to re-install Office 365.
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**http://www.thewindowsclub.com/uninstall-microsoft-office-2013-365******- This page is a “how-to” on using 27390501 and has screen captures of the whole uninstall process
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NOTE:BEFOREyou start the uninstall,
If you have an Office 365 bundle or Office 2016 / 2019, make sure you can access the MyAccount page so you can reinstall.
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If you have Office 2013/2016 make sure you have your 25 character product key.
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If you have 2010 or earlier, you need the full 25 character Product Key to activate Office. If need be, you can “extract” the key from Windows.
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Method 3: Manually uninstall Office
https://support.office.com/en-us/article/manually-uninstall-office-4e2904ea-25c8-4544-99ee-17696bb3027b
IMPORTANT: Before you start, you need to know removing Office manually is a long, complex process and might require that you reinstall the operating system if certain steps are done incorrectly.
Select your version of Office from below.