Hi nik,
I am Vijay, an Independent Advisor. I am here to work with you on this problem.
Please try these options one by one and check after each option.
- For Office only - Try repairing your Office installation. First try Quick Repair (takes 5 - 10 mins) , if that doesn't help then try Online Repair (Takes more than 30 mins but less than 1 hour in general)
Note for Office 2013 and below - Please repair only if you have product key with you as sometimes it asks for the product key again after the repair.
How to repair instructions -
https://support.office.com/en-us/article/Repair...
- Run Built-in & Guided Walk through Windows Update troubleshooter
Built-in : Windows Key+X > Click Settings > Click Update & security > Click Troubleshoot > Click Windows Update > Click Run the Troubleshooter
Guided Walk though - https://support.microsoft.com/en-us/help/10164/...
- Run SFC Scan & DISM
How to - https://answers.microsoft.com/thread/bc609315-d...
- I would recommend that you perform a Windows 10 repair upgrade. Repair upgrade fixes all Windows errors and retains all files, applications and settings. (You will not lose any data while backup is a good idea) Below is a good guide to perform repair upgrade
https://www.tenforums.com/tutorials/16397-repai...
Do let me know if you require any further help on this. Will be glad to help you.
Disclaimer - This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.