If you run into issues while installing Office 16/ Office 365 on your Windows PC,
Windows provides with a FixTool to remove office from your system and perform a clean install in your system.
The tool can be found at:
https://support.office.com/en-us/article/uninstall-office-from-a-pc-9dd49b83-264a-477a-8fcc-2fdf5dbf61d8
(Link as of 3rd March 2018)
Follow the instructions listed on the page and you should have installed Office completely from your system
1.
Command Win+R and type in regedit.
You need to provide administrator permissions in order to make any changes to the registry.
2. Find the enteries in HKLM(HostKey_LocalMachine) or HKCU(HostKey_CurrentUser). The enteries generally are:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServicesOnce
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce
HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnceEx
3. Delete the values that you need to remove.
4. Confirm your changes. Restart your machine to see the changes in effect.